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Making every researcher seek grants is a broken model

from The Roots of Progress | Articles [alt+shift+b] in science

When Galileo wanted to study the heavens through his telescope, he got money from those legendary patrons of the Renaissance, the Medici. To win their favor, when he discovered the moons of Jupiter, he named them the Medicean Stars. Other scientists and inventors offered flashy gifts, such as Cornelis Drebbel’s perpetuum mobile (a sort of astronomical clock) given to King James, who made Drebbel court engineer in return. The other way to do research in those days was to be independently wealthy: the Victorian model of the gentleman scientist. Meisterdrucke Eventually we decided that requiring researchers to seek wealthy patrons or have independent means was not the best way to do science. Today, researchers, in their role as “principal investigators” (PIs), apply to science funders for grants. In the US, the NIH spends nearly $48B annually, and the NSF over $11B, mainly to give such grants. Compared to the Renaissance, it is a rational, objective, democratic system. However, I have come to believe that this principal investigator model is deeply broken and needs to be replaced. That was the thought at the top of my mind coming out of a working group on “Accelerating Science” hosted by the Santa Fe Institute a few months ago. (The thoughts in this essay were inspired by many of the participants, but I take responsibility for any opinions expressed here. My thinking on this was also influenced by a talk given by James Phillips at a previous metascience conference. My own talk at the workshop was written up here earlier.) What should we do instead of the PI model? Funding should go in a single block to a relatively large research organization of, say, hundreds of scientists. This is how some of the most effective, transformative labs in the world have been organized, from Bell Labs to the MRC Laboratory of Molecular Biology. It has been referred to as the “block funding” model. Here’s why I think this model works: Specialization A principal...
26th Jan 2024

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What is progress?

In one sense, the concept of progress is simple, straightforward, and uncontroversial. In another sense, it contains an entire worldview. The most basic meaning of “progress” is simply advancement along a path, or more generally from one state to another that is considered more advanced by some standard. (In this sense, progress can be good, neutral, or even bad—e.g., the progress of a disease.) The question is always: advancement along what path, in what direction, by what standard? Types of progress “Scientific progress,” “technological progress,” and “economic progress” are relatively straightforward. They are hard to measure, they are multi-dimensional, and we might argue about specific examples—but in general, scientific progress consists of more knowledge, better theories and explanations, a deeper understanding of the universe; technological progress consists of more inventions that work better (more powerfully or reliably or efficiently) and enable us to do more things; economic progress consists of more production, infrastructure, and wealth. Together, we can call these “material progress”: improvements in our ability to comprehend and to command the material world. Combined with more intangible advances in the level of social organization—institutions, corporations, bureaucracy—these constitute “progress in capabilities”: that is, our ability to do whatever it is we decide on. True progress But this form of progress is not an end in itself. True progress is advancement toward the good, toward ultimate values—call this “ultimate progress,” or “progress in outcomes.” Defining this depends on axiology; that is, on our theory of value. To a humanist, ultimate progress means progress in human well-being: “human progress.” Not everyone agrees on what constitutes well-being, but it certainly includes health, happiness, and life satisfaction. In my opinion, human well-being is not purely material, and not purely hedonic: it also includes “spiritual” values such as knowledge, beauty, love, adventure, and purpose. The humanist also sees other kinds of progress contributing to human well-being: “moral progress,” such as the decline of violence, the elimination of slavery, and the spread of equal rights for all races and sexes; and more broadly “social progress,” such as the evolution from monarchy to representative democracy, or the spread of education and especially literacy. Others have different standards. Biologist David Graber called himself a “biocentrist,” by which he meant … those of us who value wildness for its own sake, not for what value it confers upon mankind. … We are not interested in the utility of a particular species, or free-flowing river, or ecosystem, to mankind. They have intrinsic value, more value—to me—than another human body, or a billion of them. … Human happiness, and certainly human fecundity, are not as important as a wild and healthy planet. By this standard, virtually all human activity is antithetical to progress: Graber called humans “a cancer… a plague upon ourselves and upon the Earth.” Or for another example, one Lutheran stated that his “primary measure of the goodness of a society is the population share which is a baptized Christian and regularly attending church.” The idea of progress isn’t completely incompatible with some flavors of environmentalism or of religion (and there are both Christians and environmentalists in the progress movement!) but these examples show that it is possible to focus on a non-human standard, such as God or Nature, to the point where human health and happiness become irrelevant or even diametrically opposed to “progress.” Unqualified progress What are we talking about when we refer to “progress” unqualified, as in “the progress of mankind” or “the roots of progress”? “Progress” in this sense is the concept of material progress, social progress, and human progress as a unified whole. It is based on the premise that progress in capabilities really does on the whole lead to progress in outcomes. This doesn’t mean that all aspects of progress move in lockstep—they don’t. It means that all aspects of progress support each other and over the long term depend on each other; they are intertwined and ultimately inseparable. Consider, for instance, how Patrick Collison and Tyler Cowen defined the term in their article calling for “progress studies”: By “progress,” we mean the combination of economic, technological, scientific, cultural, and organizational advancement that has transformed our lives and raised standards of living over the past couple of centuries. David Deutsch, in The Beginning of Infinity, is even more explicit, saying that progress includes “improvements not only in scientific understanding, but also in technology, political institutions, moral values, art, and every aspect of human welfare.” Skepticism of this idea of progress is sometimes expressed as: “progress towards what?” The undertone of this question is: “in your focus on material progress, you have lost sight of social and/or human progress.” On the premise that different forms of progress are diverging and even coming into opposition, this is an urgent challenge; on the premise that progress a unified whole, it is a valuable intellectual question but not a major dilemma. Historical progress “Progress” is also an interpretation of history according to which all these forms of progress have, by and large, been happening. In this sense, the study of “progress” is the intersection of axiology and history: given a standard of value, are things getting better? In Steven Pinker’s book Enlightenment Now: The Case for Reason, Science, Humanism, and Progress, the bulk of the chapters are devoted to documenting this history. Many of the charts in that book were sourced from Our World in Data, which also emphasizes the historical reality of progress. So-called “progress” Not everyone agrees with this concept of progress. It depends on an Enlightement worldview that includes confidence in reason and science, and a humanist morality. One argument against the idea of progress claims that material progress has not actually led to human well-being. Perhaps the benefits of progress are outweighed by the costs and risks: health hazards, technological unemployment, environmental damage, existential threats, etc. Some downplay or deny the benefits themselves, arguing that material progress doesn’t increase happiness (owing to the hedonic treadmill), that it doesn’t satisfy our spiritual values, or that it degrades our moral character. Rousseau famously asserted that “the progress of the sciences and the arts has added nothing to our true happiness” and that “our souls have become corrupted to the extent that our sciences and our arts have advanced towards perfection.” Others, as mentioned above, argue for a different standard of value altogether, such as nature or God. (Often these arguments contain some equivocation between whether these things are good in themselves, or whether we should value them because they are good for human well-being over the long term.) When people start to conclude that progress is not in fact good, they talk about this as no longer “believing in progress.” Historian Carl Becker, writing in the shadow of World War I, said that “the fact of progress is disputed and the doctrine discredited,” and asked: “May we still, in whatever different fashion, believe in the progress of mankind?” In 1991, Christopher Lasch asked: How does it happen that serious people continue to believe in progress, in the face of massive evidence that might have been expected to refute the idea of progress once and for all? Those who dispute the idea of progress often avoid the term, or quarantine it in scare quotes: so-called “progress.” When Jeremy Caradonna questioned the concept in The Atlantic, the headline was: “Is ‘Progress’ Good for Humanity?” One of the first court rulings on environmental protection law, in 1971, said that such law represented “the commitment of the Government to control, at long last, the destructive engine of material ‘progress.’” Or consider this from Guns, Germs, and Steel: … I do not assume that industrialized states are “better” than hunter-gatherer tribes, or that the abandonment of the hunter-gatherer lifestyle for iron-based statehood represents “progress,” or that it has led to an increase in human happiness. The idea of progress is inherently an idea that progress, overall, is good. If “progress” is destructive, if it does not in fact improve human well-being, then it hardly deserves the name. Contrast this with the concept of growth. “Growth,” writ large, refers to an increase in the population, the economy, and the scale of human organization and activity. It is not inherently good: everyone agrees that it is happening, but some are against it; some even define themselves by being against it (the “degrowth” movement). No one is against progress, they are only against “progress”: that is, they either believe in it, or deny it. The most important question in the philosophy of progress, then, is whether the idea of progress is valid—whether “progress” is real. “Progress” in the 19th century Before the World Wars, there was an idea of progress that went even beyond what I have defined above, and which contained at least two major errors. One error was the idea that progress is inevitable. Becker, in the essay quoted above, said that according to “the doctrine of progress,” the Idea or the Dialectic or Natural Law, functioning through the conscious purposes or the unconscious activities of men, could be counted on to safeguard mankind against future hazards. … At the present moment the world seems indeed out of joint, and it is difficult to believe with any conviction that a power not ourselves … will ever set it right. (Emphasis added.) The other was the idea that moral progress was so closely connected to material progress that they would always move together. Condorcet believed that prosperity would “naturally dispose men to humanity, to benevolence and to justice,” and that “nature has connected, by a chain which cannot be broken, truth, happiness, and virtue.” The 20th century, with the outbreak of world war and the rise of totalitarianism, proved these ideas disastrously wrong. “Progress” in the 21st century and beyond To move forward, we need a wiser, more mature idea of progress. Progress is not automatic or inevitable. It depends on choice and effort. It is up to us. Progress is not automatically good. It must be steered. Progress always creates new problems, and they don’t get solved automatically. Solving them requires active focus and effort, and this is a part of progress, too. Material progress does not automatically lead to moral progress. Technology within an evil social system can do more harm than good. We must commit to improving morality and society along with science, technology, and industry. With these lessons well learned, we can rescue the idea of progress and carry it forward into the 21st century and beyond.

9th Mar 2024 • 156 votes
Event, Feb 29: “Towards a New Philosophy of Progress” in Boston and on Zoom

On Thursday, February 29, I’ll be giving my talk “Towards a New Philosophy of Progress” to the New England Legal Foundation, for their Economic Liberty Speaker Series. The talk will be held over breakfast at NELF’s offices in Boston, and will also be livestreamed over Zoom. See details and register here. This is a talk I have given before in other venues. The description: Enlightenment thinkers were tremendously optimistic about the potential for human progress: not only in science and technology, but also in morality and society. This belief lasted through the 19th century—but in the 20th century, after the World Wars, it gave way to fear, skepticism, and distrust. Now, in the 21st century, we need a new way forward: a new philosophy of progress. What events and ideas challenged the concept of progress? How can we restore it on a sound foundation? And how can we establish a bold, ambitious vision for the future?

21st Feb 2024 • 109 votes
Cellular reprogramming, pneumatic launch systems, and terraforming Mars

In December, I went to the Foresight Institute’s Vision Weekend 2023 in San Francisco. I had a lot of fun talking to a bunch of weird and ambitious geeks about the glorious abundant technological future. Here are few things I learned about (with the caveat that this is mostly based on informal conversations with only basic fact-checking, not deep research): Cellular reprogramming Aging doesn’t only happen to your body: it happens at the level of individual cells. Over time, cells accumulate waste products and undergo epigenetic changes that are markers of aging. But wait—when a baby is born, it has young cells, even though it grew out of cells that were originally from its older parents. That is, the egg and sperm cells might be 20, 30, or 40 years old, but somehow when they turn into a baby, they get reset to biological age zero. This process is called “reprogramming,” and it happens soon after fertilization. It turns out that cell reprogramming can be induced by certain proteins, known as the Yamanaka factors, after their discoverer (who won a Nobel for this in 2012). Could we use those proteins to reprogram our own cells, making them youthful again? Maybe. There is a catch: the Yamanaka factors not only clear waste out of cells, they also reset them to become stem cells. You do not want to turn every cell in your body into a stem cell. You don’t even want to turn a small number of them into stem cells: it can give you cancer (which kind of defeats the purpose of a longevity technology). But there is good news: when you expose cells to the Yamanaka factors, the waste cleanup happens first, and the stem cell transformation happens later. If we can carefully time the exposure, maybe we can get the target effect without the damaging side effects. This is tricky: different tissues respond on different timelines, so you can’t apply the treatment uniformly over the body. There are a lot of details to be worked out here. But it’s an intriguing line of research for longevity, and it’s one of the avenues being explored at Retro Bio, among other places. Here’s a Derek Lowe article with more info and references. The BFG orbital launch system If we’re ever going to have a space economy, it has to be a lot cheaper to launch things into space. Space Shuttle launches cost over $65,000/kg, and even the Falcon Heavy costs $1500/kg. Compare to shipping costs on Earth, which are only a few dollars per kilogram. A big part of the high launch cost in traditional systems is the rocket, which is discarded with each launch. SpaceX is bringing costs down by making reusable rockets that land gently rather than crashing into the ocean, and by making very big rockets for economies of scale (Elon Musk has speculated that Starship could bring costs as low as $10/kg, although this is a ways off, since right now fuel costs alone are close to that amount). But what if we didn’t need a rocket at all? Rockets are pretty much our only option for propulsion in space, but what if we could give most of the impulse to the payload on Earth? J. Storrs Hall has proposed the “space pier,” a runway 300 km long mounted atop towers 100 km tall. The payload takes an elevator 100 km up to the top of the tower, thus exiting the atmosphere and much of Earth’s gravity well. Then a linear induction motor accelerates it into orbit along the 300 km track. You could do this with a mere 10 Gs of acceleration, which is survivable by human passengers. Think of it like a Big Friendly Giant (BFG) picking up your payload and then throwing it into orbit. Hall estimates that this could bring launch costs down to $10/kg, if the pier could be built for a mere $10 billion. The only tiny little catch with the space pier is that there is no technology in existence that could build it, and no construction material that a 100 km tower could be made of. Hall suggests that with “mature nanotechnology” we could build the towers out of diamond. OK. So, probably not going to happen this decade. What can we do now, with today’s technology? Let’s drop the idea of using this for human passengers and just consider relatively durable freight. Now we can use much higher G-forces, which means we don’t need anything close to 300 km of distance to accelerate over. And, does it really have to be 100 km tall? Yes, it’s nice to start with an altitude advantage, and with no atmosphere, but both of those problems can be overcome with sufficient initial velocity. At this point we’re basically just talking about an enormous cannon (a very different kind of BFG). This is what Longshot Space is doing. Build a big long tube in the desert. Put the payload in it, seal the end with a thin membrane, and pump the air out to create a vacuum. Then rapidly release some compressed gasses behind the payload, which bursts through the membrane and exits the tube at Mach 25. One challenge with this is that a gas can only expand as fast as the speed of sound in that gas. In air this is, of course, a lot less than Mach 25. One thing that helps is to use a lighter gas, in which the speed of sound is higher, such as helium or (for the very brave) hydrogen. Another part of the solution is to give the payload a long, wedge-shaped tail. The expanding gasses push sideways on this tail, which through the magic of simple machines translates into a much faster push forwards. There’s a brief discussion and illustration of the pneumatics in this video. Now, if you are trying to envision “big long tube in the desert”, you might be wondering: is the tube angled upwards or something? No. It is basically lying flat on the ground. It is expensive to build a long straight thing that points up: you have to dig a deep hole and/or build a tall tower. What about putting it on the side of a mountain, which naturally points up? Building things on mountains is also hard; in addition, mountains are special and nobody wants to give you one. It’s much easier to haul lots of materials into the middle of the desert; also there is lots of room out there and the real estate is cheap. Next you might be wondering: if the tube is horizontal, isn’t it pointed in the wrong direction to get to space? I thought space was up? Well, yes. There are a few things going on here. One is that if you travel far enough in a straight line, the Earth will curve away from you and you will eventually find yourself in space. Another is that if you shape the projectile such that its center of pressure is in the right place relative to its center of mass, then it will naturally angle upward when it hits the atmosphere. Lastly, if you are trying to get into orbit, most of the velocity you need is actually horizontal anyway. In fact, if and when you reach a circular orbit, you will find that all of your velocity is horizontal. This means that there is no way to get into orbit purely ballistically, with a single impulse imparted from Earth. Any satellite, for instance, launched via this system will need its own rocket propulsion in order to circularize the orbit once it reaches altitude (even leaving aside continual orbital adjustments during its service lifetime). But we’re now talking about a relatively small rocket with a small amount of fuel, not the big multi-stage things that you need to blast off from the surface. And presumably someday we will be delivering food, fuel, tools, etc. to space in packages that just need to be caught by whoever is receiving them. Longshot estimates that this system, like Starship or the space pier, could get launch costs down to about $10/kg. This might be cheap enough that launch prices could be zero, subsidized by contracts to buy fuel or maintenance, in a space-age version of “give away the razor and sell the blades.” Not only would this business model help grow the space economy, it would also prove wrong all the economists who have been telling us for decades that “there’s no such thing as a free launch.” Mars could be terraformed in our lifetimes Terraforming a planet sounds like a geological process, and so I had sort of thought that it would require geological timescales, or if it could really be accelerated, at least a matter of centuries or so. You drop off some algae or something on a rocky planet, and then your distant descendants return one day to find a verdant paradise. So I was surprised to learn that major changes on Mars could, in principle, be made on a schedule much shorter than a single human lifespan. Let’s back up. Mars is a real fixer-upper of a planet. Its temperature varies widely, averaging about −60º C; its atmosphere is thin and mostly carbon dioxide. This severely depresses its real estate values. Suppose we wanted to start by significantly warming the planet. How do you do that? Let’s assume Mars’s orbit cannot be changed—I mean, we’re going to get in enough trouble with the Sierra Club as it is—so the total flux of solar energy reaching the planet is constant. What we can do is to trap a bit more of that energy on the planet, and prevent it from radiating out into space. In other words, we need to enhance Mars’s greenhouse effect. And the way to do that is to give it a greenhouse gas. Wait, we just said that Mars’s atmosphere is mostly CO2, which is a notorious greenhouse gas, so why isn’t Mars warm already? It’s just not enough: the atmosphere is very thin (less than 1% of the pressure of Earth’s atmosphere), and what CO2 there is only provides about 5º of warming. We’re going to need to add more GHG. What could it be? Well, for starters, given the volumes required, it should be composed of elements that already exist on Mars. With the ingredients we have, what can we make? Could we get more CO2 in the atmosphere? There is more CO2 on/under the surface, in frozen form, but even that is not enough for the task. We need something else. What about CFCs? As a greenhouse gas, they are about four orders of magnitude more efficient than CO2, so we’d need a lot less of them. However, they require fluorine, which is very rare in the Martian soil, and we’d still need about 100 gigatons of it. This is not encouraging. One thing Mars does have a good amount of is metal, such as iron, aluminum, and magnesium. Now metals, you might be thinking, are not generally known as greenhouse gases. But small particles of conductive metal, with the right size and shape, can act as one. A recent paper found through simulation that “nanorods” about 9 microns long, half the wavelength of the infrared thermal radiation given off by a planet, would scatter that radiation back to the surface (Ansari, Kite, Ramirez, Steele, and Mohseni, “Warming Mars with artificial aerosol appears to be feasible”—no preprint online, but this poster seems to represent earlier work). Suppose we aim to warm the planet by about 30º C, enough to melt surface water in the polar regions during the summer, and bring Mars much closer to Earth temperatures. AKRSM’s simulation says that we would need to put about 400 mg/m3 of nanorods into the Martian sky, an efficiency (in warming per unit mass) more than 2000x greater than previously proposed methods. The particles would settle out of the atmosphere slowly, at less than 1/100 the rate of natural Mars dust, so only about 30 liters/sec of them would need to be released continuously. If we used iron, this would require mining a million cubic meters of iron per year—quite a lot, but less than 1% of what we do on Earth. And the particles, like other Martian dust, would be lifted high in the atmosphere by updrafts, so they could be conveniently released from close to the surface. Wouldn’t metal nanoparticles be potentially hazardous to breathe? Yes, but this is already a problem from Mars’s naturally dusty atmosphere, and the nanorods wouldn’t make it significantly worse. (However, this will have to be solved somehow if we’re going to make Mars habitable.) Kite told me that if we started now, given the capabilities of Starship, we could achieve the warming in a mere twenty years. Most of that time is just getting equipment to Mars, mining the iron, manufacturing the nanorods, and then waiting about a year for Martian winds to mix them throughout the atmosphere. Since Mars has no oceans to provide thermal inertia, the actual warming after that point only takes about a month. Kite is interested in talking to people about the design of a the nanorod factory. He wants to get a size/weight/power estimate and an outline design for the factory, to make an initial estimate of how many Starship landings would be needed. Contact him at [email protected]. I have not yet gotten Kite and Longshot together to figure out if we can shoot the equipment directly to Mars using one really enormous space cannon. Thanks to Reason, Mike Grace, and Edwin Kite for conversations and for commenting on a draft of this essay. Any errors or omissions above are entirely my own.

4th Jan 2024 • 45 votes
Accelerating science through evolvable institutions

This is the written version of a talk presented to the Santa Fe Institute at a working group on “Accelerating Science.” We’re here to discuss “accelerating science.” I like to start on topics like this by taking the historical view: When (if ever) has science accelerated in the past? Is it still accelerating now? And what can we learn from that? I’ll submit that science, and more generally human knowledge, has been accelerating, for basically all of human history. I can’t prove this yet (and I’m only about 90% sure of it myself), but let me appeal to your intuition: Behaviorally modern humans are over 50,000 years old Writing is only about 5,000 years old, so for more than 90% of the human timeline, we could only accumulate as much knowledge as could fit in an oral tradition In the ancient and medieval world, we had only a handful of sciences: astronomy, geometry, some number theory, some optics, some anatomy In the centuries after the Scientific Revolution (roughly 1500s–1700s), we got the heliocentric theory, the laws of motion, the theory of gravitation, the beginnings of chemistry, the discovery of the cell, better theories of optics In the 1800s, things really got going, and we got electromagnetism, the atomic theory, the theory of evolution, the germ theory In the 1900s things continued strong, with nuclear physics, quantum physics, relativity, molecular biology, and genetics I’m leaving aside the question of whether science has slowed down since ~1950 or so, which I don’t have a strong opinion on. Even if it has, that’s mostly a minor, recent blip in the overall pattern of acceleration across the broad sweep of history. (Or, you know, the beginning of a historically unprecedented reversal and decline. One or the other.) Part of the reason I’m pretty convinced of this accelerating pattern is that it’s not just science that is accelerating: pretty much all measures of human advancement show the same trend, including world GDP and world population. What drives acceleration in science? Many factors, including: Funding. Once, scientists had to seek patronage, or be independently wealthy. Now there is grant money available, and the total amount of funding has increased significantly in the last several decades: American Association for the Advancement of Science People. More scientists (all else being equal) means science moves faster, and the number of scientists has grown dramatically, both because of overall population growth and because of a greater portion of the workforce going into research. In Science Since Babylon, Derek J. de Solla Price suggested that “Some 80 to 90 percent of all scientists that have ever been, are alive now,” and this is probably still true: Eric Gastfriend Instruments. Better tools means we can do more and better science. Galileo had a simple telescope; now we have JWST and LIGO. Computation. More computing power means more and better ways to process data. Communication. The faster and better that ideas can spread, the more efficient and effective scientific communication can be. The scientific journal was invented only after the printing press; the Internet enabled preprint servers such as arXiv. Method. Better methods make for better science, from Baconian empiricism to Koch’s postulates to the RCT (and really, all of statistics). Institutions. Laboratories, universities, journals, funding agencies, etc. all make up an ecosystem that enables modern science. Social status. The more science carries respect and prestige, the more people and money flow into it. Now, if we want to ask whether science will continue to accelerate, we could think about which of these driving factors will continue to grow. I would suggest that: Funding for science will continue to grow as long as the world economy does Instruments, computation, and communication will continue to improve along with technology in general I see no reason why method should not continue to improve, as part of science itself The social status of science seems fairly strong: it is a respected and prestigious institution that receives some of society’s top honors In the long run, we may run out of people to continue to grow the base of researchers, if world population levels off as it is projected to do, and that is a potential concern, but not my focus today. The biggest red flag is with our institutions of science. Institutions affect all the other factors, especially the management of money and talent. And today, many in the metascience community have concerns about our institutions. Common criticisms include: Speed. It can easily take 12–18 months to get a grant (if you’re lucky) Overhead. Researchers typically spend 30–50% of their time on grants Patience. Researchers feel they need to show results regularly and can’t pursue a path that might take many years to get to an outcome Risk tolerance. Grant funding favors conservative, incremental proposals rather than bold, “high-risk, high-reward” programs (despite efforts to the contrary) Consensus. A field can converge on a hypothesis and prune alternate branches of study too quickly Researcher age. The trend over time is for grant money to go to older, more established researchers Freedom. Scientists lack the freedom to direct their research fully autonomously; grant funding has too many strings attached Now, as a former tech founder, I can’t help but notice that most of these problems seem much alleviated in the world of for-profit VC funding. Raising VC money is relatively quick (typically a round comes together in a few months rather than a year or more). As a founder/CEO, I spent about 10–15% of my time fundraising, not 30–50%. VCs make bold bets, actively seek contrarian positions, and back young upstarts. They mostly give founders autonomy, perhaps taking a board seat for governance, and only firing the CEO for very bad performance. (The only concern listed above that startup founders might also complain about is patience: if your money runs out, you’d better have progress to show for it, or you’re going to have a bad time raising the next round.) I don’t think the VC world does better on these points because VCs are smarter, wiser, or better people than science funders—they’re not. Rather, VCs: Compete for deals (and really don’t want to miss good deals) Succeed or fail in the long run based on the performance of their portfolio See those outcomes within a matter of ~5–10 years In short, VCs are subject to evolutionary pressure. They can’t get stuck in obviously bad equilibria because if they do they will get out-competed and lose market power. The proof of this is that VC has evolved over the decades—mostly in the direction of better treatment for founders. For instance, there has been a long-term trend towards higher valuations at earlier stages, which ultimately means lower dilution and a shift in power from VCs to founders: it used to be common for founders to give up half or more of their company in the first round of funding; last I checked that was more like 20% or less. VCs didn’t always fund young techies right out of college; there was a time when they tended to favor more experienced CEOs, perhaps with an MBA. They didn’t always support founder-led companies; once it was common for founders to get booted after the first few years and replaced with a professional CEO (when A16Z launched in 2009 they made a big deal out of how they were not going to do that). So I think if we want to see our scientific institutions improve, we need to think about how they can evolve. How evolvable are our scientific institutions? Not very. Most scientific organizations today are departments of university or government. Much as I respect universities and government, I think anyone would have to admit that they are some of our more slow-moving institutions. (Universities in particular are extremely resilient and resistant to change: Oxford and Cambridge, for instance, date from the Middle Ages and have survived the rise and fall of empires to reach the present day fairly intact.) The challenges to the evolvability of scientific funding institutions are the inverse of what makes VC evolvable: They tend to lack competition, especially centralized federal agencies such as NIH and NSF They lack any real feedback loop in which a funder’s resources are determined somehow by past judgment and the success of their portfolio (Michael Nielsen has repeatedly pointed out that failures of funding from “Einstein did his best work as a patent clerk” to “Katalin Karikó was denied grants and tenure before she won the Nobel prize” don’t seem to even spark processes of reflection within the relevant institutions) They face long cycle times to learn the true impact of their work, which might not be apparent for 20–30 years How might we improve evolvability of science funding? We should think about how we can improve these factors. I don’t have great ideas, but I’ll throw some half-baked ones out there to start the conversation: How might we increase competition in science funding? We could increase the role of philanthropy. In the US, we could shift federal funding to the state level, creating fifty funders instead of one. (State agricultural experiment stations are a successful example of this, and competition among these stations was key to hybrid corn research, one of the biggest successes of 20th-century agricultural science.) At the international level, we could support more open immigration for scientists. How might we create better feedback loops? This is tough because we need some way to measure outcomes. One way to do that would be to shift funding away from prospective grants and more towards a wide variety of retrospective prizes, at all levels. If this “economy” were sufficiently large and robust, these outcomes could be financialized in order to create a dynamic, competitive funding ecosystem, with the right level of risk-taking and patience, the right balance of seasoned veterans vs. young mavericks, etc. (Certificates of impact, such as hypercerts, could be part of this solution.) How might we solve long feedback cycles? I don’t know. If we can’t shorten the cycles, maybe we need to lengthen the careers of funders, so they can at least learn from a few cycles—a potential benefit of longevity technology. Or, maybe we need a science funder that can learn extremely fast, can consume large amounts of historical information on research programs and their eventual outcomes, never forgets its experience, and never retires or dies—of course, I’m thinking of AI. There’s been a lot of talk of AI to support, augment, or replace scientific researchers themselves, but maybe the biggest opportunity for AI in science is on the funding and management side. I doubt that grant-making institutions will shift themselves very far in this direction: they would have to voluntarily subject themselves to competition, enforce accountability, and admit mistakes, which is rare. (Just look at the institutions now taking credit for Karikó’s Nobel win when they did so little to support her.) If it’s hard for institutions to evolve, it’s even harder for them to meta-evolve. But maybe the funders behind the funders, those who supply the budgets to the grant-makers, could begin to split up their funds among multiple institutions, to require performance metrics, or simply to shift to the retrospective model indicated above. That could supply the needed evolutionary pressure.

4th Dec 2023 • 54 votes
What I’ve been reading, November 2023

A ~monthly feature. Recent blog posts and news stories are generally omitted; you can find them in my links digests. All emphasis in bold in the quotes below was added by me. Books Finished Lynn White, Medieval Technology and Social Change (1962). Last time I talked about the stirrup thing. The second part of the book is about the introduction of the heavy plow in agriculture, and how it enabled the shift to a three-field crop rotation. Among other things, this provided more protein in the European diet, which made for a healthier population. The third part is a survey of medieval power mechanisms, including water mills, crank shafts, and clock escapements. Very interesting overall, perhaps a bit dry and technical for casual readers though. Note also that since it is from the ’60s it is not up to date with the latest research. Also finished Ian Tregillis’s The Alchemy Wars. I can now definitely recommend this sci-fi/fantasy trilogy, even if the cast of characters and the way the conflict unfolded isn’t exactly how I would have written it myself. Browsed Derek J. de Solla Price, Science since Babylon (1961), while preparing for a talk. Some very interesting charts such as this: Science since Babylon, p. 97 New on my reading list: Venkatesh Narayanamurti and Toluwalogo Odumosu, Cycles of Invention and Discovery: Rethinking the Endless Frontier (2016), and Venkatesh Narayanamurti and Jeffrey Tsao, The Genesis of Technoscientific Revolutions: Rethinking the Nature and Nurture of Research (2021). These have actually been on my list for a while, but got bumped back up after meeting Venky and Jeff at a recent workshop on metascience. (The latter book is required reading at Speculative Technologies.) Also mentioned at the workshop: B. Zorina Khan, Inventing Ideas: Patents, Prizes, and the Knowledge Economy (2020); and A Michael Noll and Michael Geselowitz, Bell Labs Memoirs: Voices of Innovation (2011). Also: Pedro Domingos, The Master Algorithm: How the Quest for the Ultimate Learning Machine Will Remake Our World (2015) Robert Martello, Midnight Ride, Industrial Dawn: Paul Revere and the Growth of American Enterprise (2010) Jessie Singer, There Are No Accidents: The Deadly Rise of Injury and Disaster—Who Profits and Who Pays the Price (2022) Ursula Le Guin, The Dispossessed (1974) (sci-fi) Articles Ray Kurzweil, “The Law of Accelerating Returns” (2001). Kurzweil strikes me as a grand theorist but not a careful scholar—a risky combination. For instance, he writes: “Homo sapiens evolved in a few hundred thousand years. Early stages of technology—the wheel, fire, stone tools—took tens of thousands of years to evolve and be widely deployed.” Stone tools, fire, and the wheel are often depicted in cartoons featuring cavemen. But stone tools evolved over millions of years; the controlled use of fire is something like several hundred thousand years old; and both predate Homo sapiens. The wheel came much later, well after agriculture and settled society. Details like this are a warning to tread carefully. That said, I was interested to read this essay because I am starting to see the truth and significance of its core idea: that human progress accelerates over time, following a super-exponential curve. This phenomenon has been documented more broadly in the economics literature, such as by Jones and Romer (2010), who refer to “accelerating growth” as one of the key stylized facts that growth models should attempt to explain. I have described acceleration as resulting from the compounding of multiple feedback loops: increases in wealth, population, science, markets, institutions, and technology allow us to invent more, improve institutions, expand markets, advance science, grow population, accumulate wealth, etc. Kurzweil sees the phenomenon as not merely technological, but biological—a feature of evolution as such (and he sees technological evolution as simply a continuation of biological evolution by more efficient means). In his telling, as evolution progresses, it sometimes evolves better mechanisms for evolving. This is a very intruiging idea, but he doesn’t argue it with any rigor or present much evidence for it, and I don’t know enough about biology or evolution to evaluate it. He mentions “cells” as the “first step” in evolution, and then refers to “the subsequent emergence of DNA” (but wasn’t DNA present from the origins of life?) He indicates that evolution sped up during the Cambrian Explosion, and credits this to “setting the ‘designs’ of animal body plans”, but doesn’t elaborate on the causal connection except to say that this “allowed rapid evolutionary development of other body organs, such as the brain.” Presumably sexual reproduction should be a major event in this story, since it allows for more variation through genetic recombination, but he doesn’t mention it. So, it’s very unclear to me what to make of this story (although if it’s right, it would extend the “accelerating progress” pattern backwards by more than three billion years). Ray Kurzweil Grand theories aside, I was very interested in his analysis of computing power. He plotted the computing speed per dollar of dozens of devices, all the way from late 19th-century mechanical calculators through early 21st-century microprocessors, and claims to have found a increasing cost-performance curve running through five generations of computing technology: purely mechanical, electromechanical, vacuum tube, transistor, and integrated circuit. Moore’s Law is only the fifth and most recent segment of this much longer trend, one exponential portion of an overall super-exponential curve: Kurzweil, The Law of Accelerating Returns I’d like to check the data and sources on this one, but it’s a very intriguing pattern. The full essay is very long and covers many not-super-well-connected topics, which I don’t have time to comment on; the core idea is in this 2004 Edge question, but doesn’t contain all the most interesting details (such as the computing trends just mentioned). The same accelerating curve, and the same basic explanation based on feedback loops, seems to be the gist of David Roodman, “Modeling the Human Trajectory” (2020), which I have only skimmed but plan to return to. Others: Deirdre N. McCloskey reviews Acemoglu and Johnson’s Power and Progress (2023). If you know anything about the book, and anything about McCloskey, you won’t be surprised that she is critical: The invisible hand of human creativity and innovation, in the authors’ analysis, requires the wise guidance of the state. … This is a perspective many voters increasingly agree with—and politicians from Elizabeth Warren to Marco Rubio. We are children, bad children (viewed from the right) or sad children (viewed from the left). Bad or sad, as children we need to be taken in hand. Messrs. Acemoglu and Johnson warmly admire the U.S. Progressive Movement of the late 19th century as a model for their statism: experts taking child‐citizens in hand. Robert Tracinski, “We Are All Philosophers Now” and “The Dilemma of Choice” (2023). Modernity has replaced a narrow, limited set of social roles and life choices with a smorgasbord of options. This is liberating, but the price of the freedom of choice is the responsibility of choice, which is now everyone’s to bear. Not everyone is happy about this. Rob’s pithy summary: “If Socrates said that the unexamined life is not worth living, well, now it’s not really an option.” Virginia Postrel, “What ails American culture?” (2023). On similar themes: Human beings need to feel purpose and meaning in their lives. But I am not entirely sure that the current discontent is a product of material abundance, that people did not feel similar discontent in the past, or that the “economic problem” loomed so large in the past that it dwarfed all other problems. Ben Landau-Taylor, “The Vocabulary Of Power” (2023). “Power” can mean many things; here are four more precise terms. Not only will this help clarify your concepts, it will also fulfill your daily quota of thinking about the Roman Empire. Tanner Greer, “Where Have All the Great Works Gone?” (2021): Spengler … repeatedly describes Tolstoy (d. 1910), Ibsen (d. 1906), Nietzsche (d. 1900), Hertz (d. 1894), Dostoevsky (d. 1881), Marx (d. 1883), and Maxwell (1879) as figures of defining “world-historical” importance… Spengler began writing Decline of the West in 1914. Tolstoy was only four years dead when Spengler started his book; Marx was only 30 years deceased. … Is there anyone who died in the last decade you could make that sort of claim for? How about for the last two decades? The last three? Gideon Lewis-Kraus, “They Studied Dishonesty. Was Their Work a Lie?” (2023). A case study of scientific fraud. Stephen Wolfram, “Are All Fish the Same Shape If You Stretch Them? The Victorian Tale of On Growth and Form” (2017) I just thought this idea was kind of hilarious: D’Arcy Thompson, On Growth and Form

7th Nov 2023 • 60 votes

More in science

Windows Are Absurd

[Note that this article is a transcript of the video embedded above.] Have you ever thought about windows? Like really considered the idea? If we hadn’t been exposed to them our entire lives, it might seem like kind of a bizarre concept. On the face of it, windows are about light. But it’s more esoteric than that, especially now that we can make our own light. We want to be inside, but not all the way inside. So we put holes in the wall. It’s a heck of a trade-off: you get light and a view of the outdoors, but it comes at a cost. Not just the cost of the glass itself, but also the structural changes they require and their effects on ventilation, sound, cooling, heating, safety, and security inside a building. As simple as they seem, windows are a technology of sorts. And like a lot of building science, we’ve slowly been making progress, readjusting those tradeoffs and giving us the benefits without so many of the costs. I love to pick a relatively innocuous part of the built environment and really take a close look. So, I’ve built a few demonstrations in the garage to show you how far the science of glazing has come. I’m Grady, and this is Practical Engineering. Glass is not a good substitute for an exterior wall, in many respects. If you take some wall away and replace it with a window, you’re not trading like-for-like. For one, you never accidentally throw a baseball through a brick wall. But it’s especially true when it comes to heat. And this is a pretty big deal because we collectively spend vast sums of money, resources, effort, and energy on maintaining a comfortable thermal climate inside our buildings. Almost all the time, in almost all the places, the temperature outside of a building is different from the temperature we want it to be inside. But the laws of physics (also all the time in all the places) are constantly working to equalize those temperatures. We usually categorize the flow of heat into three separate modes. Conduction is heat moving through solid objects, atoms or molecules that are tightly packed, transmitting energy to their neighbors directly by vibrating against each other. Convection is heat transfer via the movement of a fluid like air or water. Radiation is heat transfer through electromagnetic waves. Since it is literally light, radiation doesn’t need a medium. All three play a role in the walls of buildings. And of course, it works both ways: sometimes it’s too hot outside and you want to keep that heat out. Sometimes it’s too cold and you want to keep the heat in. Any movement of heat from inside to out or vice versa is a flow of power, just like we measure with electricity. If you have 500 watts of heat flowing out of your house, you essentially need a 500 watt heater inside to make up for the loss and maintain a steady temperature. And just like voltage is a difference in potential that drives electrical current, heat flow is driven by a difference in temperature. The bigger that difference, the greater the flow of heat through a given wall. Continuing the electrical metaphor, insulation is the generic term we use to describe materials that resist the transmission of heat from one side to the other. It makes sense that we put it in our walls. In the US, we use R-value as a measure of this resistance. This is kind of a cursed unit of measurement, so I’m going to gloss over the scientific definition. But, a typical exterior wall assembly will usually have an R value between 10 and 25, depending on climate and how new the building is. A simple pane of glass has an R value of about 1. Let me show that to you. I built this box of foam insulation in my garage. Inside, I have a 25 watt ceramic heat emitter. I can close this up and wait for the temperature inside to stabilize. When that happens, we can assume that the heat going into the box is the same as the heat flowing out. Okay, this has pretty much settled out, and you can see that the difference between the interior and exterior probes is about 43 degrees Fahrenheit, I think that’s around 24 celsius. This is R-5 foam, soif you do the math for a perfectly sealed box with these dimensions that should be right around 50 F, 28 C, um, so accounting for the imperfections in my setup, like this, uh, terrible tape seal, that’s actually pretty close. Um, so now I’m going to swap this lid out with a pane of glass, and we’ll set this going again. Okay, this has settled out. And you can see that the temperature inside the shop hasn’t really changed, but the temperature inside the box has gone down a lot compared to the foam lid. The difference is about 22 F, which I think is around 13 C. So, just replacing one side of the box with glass instead of foam, it takes a much smaller difference in temperature to move that same 25 watts out of the box. I’m sure you see the issue here. If we want windows in our buildings, it comes at a cost of thermal efficiency. For every square foot or square meter of exterior wall that we swap with single pane windows, heat will move through that space roughly 10 to 25 times faster. So, we rarely use single-pane glazing anymore. Almost all modern windows use two, and sometimes even three panes of glass with a sealed air gap between them. Sometimes this gap is filled with a heavy gas like argon or krypton that has lower conduction and convection. There are even vacuum insulated panels that have no air inside, eliminating convection entirely. It seems like a simple change, but it makes a pretty big difference. I happen to have a double-pane glass unit, so we can try the experiment again. Okay, this demo has settled out now, and you can see that the temperature difference is right at 30 F, 17 C. Remember with the foam lid it was about 43 degrees and with the single pane it was around 23 degrees. So this is basically right in the middle. It’s not as good as when there was no window, but it’s a lot better than the single pane of glass. This varies a lot with details of the frame and coatings. But very generally, modern double-pane windows can double to quadruple the insulative value of a single pane of glass, and that can make a huge difference in a building with a lot of them. This idea of a sealed air gap between panes comes with one problem. If you’ve ever brought a bag of chips on an airplane, you know what I’m talking about. If the glass manufacturer is at a low elevation and the window’s going to be installed somewhere much higher, you end up with an overpressure situation between the panes compared to the barometric pressure. That can cause them to bow out and even fracture. In some cases, manufacturers will actually dial in the pressure for the altitude of the final destination. Another option is to install a capillary tube that equalizes the pressure inside and out. These are very narrow diameter and long tubes meant to reduce the amount of moisture that diffuses between the panes, which would otherwise lead to condensation inside the unit. Insulating glass panels help reduce heat conduction and convection, but that’s not the only way heat gets into and out of a building. The whole point of a window is to let in light, and we already learned that heat can move as electromagnetic waves. Of course, if we block visible light through a window to avoid heat transfer, that kind of defeats the purpose. But radiation also happens at other wavelengths on the electromagnetic spectrum. Specifically, for the temperatures we deal with on a day-to-day basis, most of the thermal radiation happens in infrared: wavelengths longer than visible light but shorter than microwaves. Even within that range, there are big differences in how the waves interact with matter. That’s particularly true for windows. Typical stuff at ambient temperatures like a sun-baked driveway or human body, emit thermal radiation mostly in the far-infrared spectrum. This is the stuff you can see on a normal infrared camera. And even though glass is designed to let visible light through, it is almost completely opaque to longwave infrared light. Try looking through a window with an infrared camera and you just see the window itself, not anything beyond. It’s cool to think that if our eyes worked a bit differently - if they were tuned to a slightly different part of the electromagnetic spectrum - a glass window would be entirely useless. And it seems like it would be a good thing for our thermal problem, preventing heat from transferring through. Unfortunately it’s not that simple. Glass isn’t just opaque to far-IR; it’s also highly emissive. That means it mostly absorbs thermal radiation rather than reflecting it. So, the radiation doesn’t come directly through, but it does warm the glass, which can then just conduct through the pane and reradiate it where you don’t want it to go, whether inside or out. It’s basically radiation with extra steps. On the shorter wavelength part of the spectrum we call near IR, it’s a little different. The main source of near IR radiation is the sun, and like visible light, that radiation can pass directly through most glass. This is how greenhouses work. The shortwave radiation passes right through where it can warm the stuff inside. But the stuff inside radiates longwave IR, which can’t pass back out through the glass. So, windows are kind of a two-way half-door for far infrared (since they absorb and reradiate it in both directions) and a one-way door for near infrared, but we can do better than that, mostly through low-emissivity or low-e coatings. These coatings essentially convert a pane of glass into a mirror for IR. And you can see the difference really well with an IR camera. You still get some reflections with an uncoated pane, but the difference is obvious when you put a coated pane next to an uncoated one. But this gets a little tricky, especially when it comes to near IR. If you live in a cold climate and your main use of energy is heating, you’re happy to invite as much sunlight as you can get inside. You don’t want to reflect the near IR. The opposite is true in warm climates. Fortunately, manufacturers can tune the coatings according to the climate. You can reflect shortwave radiation if you’re worried most about cooling, or you can let it in to gather more heat inside. Window manufacturers also sometimes vary which face is coated. In warmer climates, you can coat the inside of the outer pane, called “surface 2,” reflecting the IR before it crosses the gap to keep it from warming the air between the panes. In cooler climates, you can put it on “surface 3” to reflect the long-waveshort-wave IR back into your house without it having to cross the air gap. Making windows more thermally efficient isn’t the only use for glass coatings. If you’re like me, there’s a good chance you have the Merlin app installed on your phone. I think it’s a bit of an inevitability that once you reach a certain age, you start getting interested in birds. Unfortunately, one of the largest human-caused sources of bird mortality is actually windows. At certain angles, windows work essentially like mirrors, reflecting the trees and sky, and birds (bless their hearts) can’t always tell the difference. It can happen the other way too. Sometimes a bird will see something inside a building or all the way through two windows that they want to fly toward, not recognizing that there’s solid glass in the way. For you and me, walking into a glass pane like a sliding door is embarrassing, but for a bird flying at much higher speeds with tiny, hollow bones, it is often fatal. McCormick Place Convention Center on the lakeshore in Chicago may be the most famous case study. In an average year, monitors would find around 1,000 dead birds around the building from collisions with the windows. In October 2023, nearly 1,000 birds died in a single night. The owner finally decided to address the problem head on, installing a pattern of dots on all the glass surrounding the building. The solution cut the number of bird strikes by 95 percent. Awareness about bird safe glass is continuing to grow, and so are the number of solutions. Many glass manufacturers have bird-safe products that work in a similar way. The goal is to break the illusion of glass being a mirror or imperceptible as a solid surface, so most of the fixes involve patterns or designs on the glass. I think it looks pretty cool, actually. And because many bird species can see into the ultraviolet spectrum, you can even get dots and patterns that are practically invisible to humans, but still perceptible to birds to keep them from crashing into windows. Some cities are already including requirements for bird safe glass into codes, particularly in major migration corridors and for buildings that use large, uninterrupted facades of glass. This is a really common design for tall buildings and skyscrapers. Ever since I was a kid, I have always been impressed with this kind of facade. From the outside, it looks like a sleek, continuous column of glass. And it’s pretty interesting how it’s actually done. These are called walls, specifically curtain walls. But they’re also not walls in the traditional sense, at least when it comes to bearing loads. We typically think of a building’s exterior walls as the primary load path - the way forces from the building are transferred to the foundation. With curtain walls, that’s not true, and that name kind of gives it away. In buildings with curtain walls, the load bearing happens through interior columns. The exterior walls just hang there. Not that this needs another analogy, but it’s pretty much like the building is wearing a coat. This has a lot of advantages. A curtain wall is relatively lightweight, reducing structural loads on a building. It’s also thin, maximizing space in a building where it comes at a premium. They’re also unitized: you get very large pieces assembled in a factory so they go up quickly on a construction site. And, of course, you get a lot of light into the building when the entire exterior wall is a window. But how do you hold the glass in place? The process of installing glass, called glazing, is not like installing most other materials. You can’t use traditional fasteners like nails or screws. Glass is brittle, and the sharp point forces would induce too much stress. If you look at the windows of your house, the glass panes are usually sandwiched inside a frame with softer material that both seals against the glass to keep out the weather and spreads out the holding forces across a larger area along the edges of the glass. That’s sometimes called captured glazing. It’s done on large buildings with expansive glass facades too, but it’s not the only way. When you really want the outside of a building to look like only glass with no mullions or framing elements protruding beyond the panes, you can use structural silicone glazing, where the sealant does some or all the work to hold the glass in place. In 4-sided structural glazing, the glass panels are adhesively bonded on all four edges. You have nothing on the exterior except smooth glass. If you’re used to the silicone sealants sold at the hardware store, this might seem absolutely crazy to you. I definitely wouldn’t trust a tube of bathroom caulk to hold thousands of pounds of glass hundreds of feet in the air above sidewalks and roads full of people. To be fair, these systems do usually have some kind of mechanical clips or toggles that surreptitiously prevent panes from coming entirely loose if the sealant fails, but also, structural silicone is very different from caulk. Just to demonstrate this, I have a glass block. First I’m going to attach this to a metal plate using typical silicone caulk you might use in the bathroom. I’m starting with a 45-pound weight on the hook, which is probably a bit ambitious. And of course, the camera died right when that dropped, but it held 45 lbs for just about a minute before it dropped. And part of that’s cause, even after 2 weeks of curing, you can see, only the caulk around the edges actually cured. This stuff is just not designed for heavy weights like this. Now I’ll try it with structural silicone. This stuff comes from a few manufacturers in a variety of strengths, curing systems, and material compatibilities. After I let this cure for a week, which is when the manufacturer says it reaches 50 percent of its strength, I tried my little demo again. Wow. It’s holding 45 pounds just fine. So I added this small metal anvil just for good measure, and it’s still holding fine. Just a silly little experiment like this can give you a lot more confidence that those big insulated glass units on tall buildings aren’t going anywhere. But the engineering of windows doesn’t stop at holding them in place. We also have to think about what happens if they break. The most typical glass we think about with picture frames and windows is actually annealed glass. The manufacturing process is pretty impressive. The molten material is allowed to spread out and float atop a bed of molten tin, making it extremely flat and very consistent in thickness. Then the glass is allowed to cool slowly, which relieves internal stresses. That makes it possible to cut along clean lines and even drill holes in the material. But it also means that when annealed glass breaks, it usually fractures into large, razor-sharp shards that can be extremely dangerous. I think most people have enough experience with the issue that there’s hardly a need at all to say that broken glass is a serious hazard. And in many cases, it’s a simply unacceptable hazard: a slip in the shower that breaks the door, a toddler on a glass tabletop, even pushing too hard on a glass door. There are plenty of documented cases where a simple accident became fatal simply because of how annealed glass becomes jagged and razor-sharp when it fractures. One of the main solutions to the problem is tempering the glass. If you heat glass and cool it down quickly, often using a high-pressure blast of air, you can get the outside to cool a little quicker than the inside of the glass. The outside faces shrink. Then when the inside cools, it shrinks as well, pulling the outside faces of the glass into compression. If you use a polarizing filter, sometimes you can even see the stresses in tempered glass. This is a tricky process because if the cooling happens unevenly, the glass will crack or break. I’ve discovered this myself by accidentally setting a glass dish on the stove burner. But if you do it right, tempering glass makes it much stronger than typical annealed glass. Since the outer faces are in compression, cracks are less able to propagate. But even if it does break, tempered glass has a big advantage. Instead of the large shards, you tiny, relatively harmless pieces. These can still have sharp edges, but just being so much smaller means they’re much less able to injure someone. They have a lot less mass when they fall, and the edges are shorter, so it’s more like angry gravel and less like deadly knives and spears. That’s why tempered glass is often called safety glass, and lots of building codes require it in situations where broken glass can pose a safety hazard like glass doors, large windows close to the ground, and in bathrooms and showers. Most vehicles also use tempered glass on the side windows to reduce the risk of injury during a crash. One disadvantage of tempered glass is that it can’t be modified after the fact. All that built-up stress in the material makes sure it shatters into tiny pieces, but it also prevents you from cutting or drilling holes. Tempering has to be the final step. The other disadvantage also comes from its main advantage. Because tempered glass breaks in a relatively safe way, it doesn’t offer much security. And really it’s true for annealed glass too. Windows aren’t just a thermal weak point in buildings; they are also a security weak point. Why would a criminal struggle to break through a reinforced door if they can just quickly smash a window? That’s where laminated glass comes in. You can glue individual panes of glass together where they still retain almost perfect optical clarity. But even better than that, you can sandwich a tough plastic interlayer between those panes of glass, creating a composite material. And it behaves a lot differently when it breaks. Now you don’t have shards separating at all. Even completely cracked apart, the glass stays adhered to the plastic instead of flying apart. And more importantly, this is still a barrier even after it breaks. I’m not getting my hand through there. Laminated glass is ideal for overhead applications, where a break could otherwise rain down shards on people below. And it’s perfect for commercial buildings, especially on ground floors, to make it more challenging for someone to break in through a window or glass door. Laminated glass is also standard on vehicle windshields to offer more protection from a road hazard that could otherwise break through the glass and injure the driver or passengers. What’s kind of crazy is that I’m just scratching the surface of modern window technology, not to mention the glass itself, which can get a lot more complicated for applications like phone screens. But these are all innovations that are kind of hiding in plain sight, and to me at least, they make the view through a window just a little bit sweeter.

6 hours ago • 1 votes
Making an Aging Clock

Is this really where longevity science needs to go?

7 hours ago • 1 votes
Another set of healthcare business ideas | Out-Of-Pocket

Reverse auctions, patient shopping for VBC, and more

8 hours ago • 1 votes
The forgotten formula for lovable cities

Camillo Sitte’s blueprint for making beautiful cities seized the imagination of the world before falling into obscurity in the twentieth century. Here is his forgotten formula.

10 hours ago • 1 votes
The Math of Democracy Never Quite Works Out

The French mathematician Nicolas de Condorcet was a passionate believer in democracy, but he also discovered a frustrating paradox within it: A majority can sometimes vote itself into a logical loop. Mathematicians have now found that this “logical loop” maps onto a strange topological shape: the Klein bottle, a surface with no distinct inside or outside. On this episode of The Quanta Podcast, host Samir Patel speaks with writer Alex Stone about this new connection between this centuries-old voting paradox and the Klein bottle — and how it illustrates just how difficult it is to translate a group of individual preferences into a single choice. This topic was covered in a recent story for Quanta Magazine. Each week on The Quanta Podcast, Quanta Magazine editor-in-chief Samir Patel and Senior Editor Hannah Waters speak with the people behind the award-winning publication to navigate through some of the most important and mind-expanding questions in science and math.

10 hours ago • 1 votes
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