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I re-read the book Hooked by Nir Eyal and these are my notes. 1/ The key question that the book answers is: how to make habit-forming products. And its answer is a model that involves four stages: a) trigger; b) action; c) variable reward; d) investment 2/ Why should products be habit-forming? It’s because only… Read More The post Notes from the book “Hooked” appeared first on Inverted Passion.
a year ago

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More from Inverted Passion

Becoming a Republic

The following is the essay I had submitted as part of the one week summer course I took at the Oxford University, where we read Plato’s Republic. The essay includes a few references to structure and specific content from the book, so if something doesn’t make sense, it’s probably because it refers to an “insider”… Read More The post Becoming a Republic appeared first on Inverted Passion.

a week ago 13 votes
Life as a physical process

It’s always hard to define life. Everyone has their favorite definition – some describe it as a struggle against entropy, while others describe it as an emergent property of chemicals. Countless books have been written on the topic, yet we’re far from a consensus. Against the backdrop of the second law of thermodynamics, life seems… Read More The post Life as a physical process appeared first on Inverted Passion.

2 months ago 26 votes
Do you know what GDP is?

I thought I knew! But the more I introspected, the hazy my understanding got. Is GDP amount of stuff produced or consumed? Does it include imports or exports? What does it have to do with well being? Why does it keep increasing? So, I fired up Claude and started understanding what GDP really is. This… Read More The post Do you know what GDP is? appeared first on Inverted Passion.

3 months ago 23 votes
Don’t compete

The Internet is full of people winning all the time. Someone is traveling to exotic locations, someone else is raising funds, and another person is winning awards. Essentially, everyone around you is succeeding while you do spend your days as the nature intended – sleeping, eating, smiling, chatting with friends, and spending time with your… Read More The post Don’t compete appeared first on Inverted Passion.

4 months ago 56 votes
2024 wrapped

This year’s review is going to be shorter than 2023 (and previous years) because I’m in Goa right now for a holiday and I don’t feel like being in front of a screen for long. I mean, just look at this view and tell me that you’d rather be in front of a screen writing… Read More The post 2024 wrapped appeared first on Inverted Passion.

7 months ago 100 votes

More in science

Brief items - Static electricity, quantum geometry, Hubbard model, + news

It's been a busy time that has cut into my blogging, but I wanted to point out some links from the past couple of weeks. Physics Today has a cover article this past issue about what is colloquially known as static electricity, but what is more technically described as triboelectricity, the transfer of charge between materials by rubbing.  I just wrote about this six months ago, and the detailed mechanisms remain poorly understood.  Large surface charge densities (like \(10^{12}\) electronic charges per square cm) can be created this way on insulators, leading to potential differences large enough to jump a spark from your finger to the door handle.  This can also lead to static electric fields near surfaces that are not small and can reveal local variations in material properties. That leads right into this paper (which I learned about from here) about the extreme shapes of the heads of a family of insects called treehoppers.  These little crawlies have head and body shapes that often have cuspy, pointy bits that stick out - spines, horns, etc.  As we learn early on about electrostatics, elongated and pointy shapes tend to lead to large local electric fields and field gradients.  The argument of this paper is that the spiky body and cranial morphology can help these insects better sense electric field distributions, and this makes it easier for them to find their way and avoid predators.  This manuscript on the arXiv this week is a particularly nice, pedagogical review article (formatted for Rev Mod Phys) about quantum geometry and Berry curvature in condensed matter systems.  I haven't had the chance to read it through, but I think this will end up being very impactful and a true resource for students to learn about these topics. Another very pretty recent preprint is this one, which examines the electronic phase diagram of twisted bilayers of WSe2, with a relative twist angle of 4.6°.  Much attention has been paid to the idea that moiré lattices can be in a regime seemingly well described by a Hubbard-like model, with an on-site Coulomb repulsion energy \(U\) and an electronic bandwidth \(W\).  This paper shows an exceptionally clean example of this, where disorder seems to be very weak, electron temperatures are quite cold, and phase diagrams are revealed that look remarkably like the phenomena seen in the cuprate superconductors (superconducting "domes" as a function of charge density adjacent to antiferromagnetic insulating states, and with "strange metal" linear-in-\(T\) resistance in the normal state near the superconducting charge density).  Results like this make me more optimistic about overcoming some of the major challenges in using twisted van der Waals materials as simulators of hard-to-solve hamilitonians. I was all set to post this earlier today, with no awful news for once about science in the US that I felt compelled to discuss, but I got sidetracked by real work.  Then, late this afternoon, this executive order about federal grants was released.   I can't sugar coat it - it's awful.  Ignoring a large volume of inflammatory rhetoric, it contains this gem, for instance:  "The grant review process itself also undermines the interests of American taxpayers."   It essentially tries to bar any new calls for proposals until a new (and problematic) process is put in place at every agency (see Sect. 3(c)).  Also, it says "All else being equal, preference for discretionary awards should be given to institutions with lower indirect cost rates."  Now, indirect cost rates are set by negotiations between institutions and the government.   Places that only do very small volumes of research have low rates, so get ready for MIT to get fewer grants and Slippery Rock University to get more.  The only certainty is that the nation's lawyers are going to have a field day with all the suits that will come out of this.

12 hours ago 3 votes
A 1-Day Virtual Symposium on Future of Astronomy

For those of you with a deeper interest in astronomy and how we learn about the universe, this may be of interest.  There is a good discount if you register before Aug. 10. The Astronomical Society of the Pacific Presents: Eyes on the Cosmos: Cutting Edge Instruments and Ideas in Astronomy On Zoom, August 21, […] The post A 1-Day Virtual Symposium on Future of Astronomy appeared first on Andrew Fraknoi - Astronomy Lectures - Astronomy Education Resources.

8 hours ago 3 votes
How Can Math Protect Our Data?

Mary Wootters discusses how error-correcting codes work, and how they are essential for reliable communication and storage. The post How Can Math Protect Our Data? first appeared on Quanta Magazine

23 hours ago 3 votes
As Fire Season Ramps Up, Thousands of U.S. Firefighting Positions Are Vacant

Every spring, Forest Service fire leaders meet to plan for the upcoming fire season. This year, some employees were shocked by the blunt remarks made during a meeting with forest supervisors and fire staff officers from across the Intermountain West. “We were told, ‘Help is not on the way,’” said one employee, who asked to remain anonymous for fear of losing their job. “I’ve never been told that before.”  Read more on E360 →

3 hours ago 1 votes