More from Damn Interesting
In certain dialects of Chinese, Japanese, Korean, and Vietnamese, the word for ‘four’ sounds very similar to the word for ‘death’1. Consequently, the number 4 is considered by many people in East Asian nations to be unlucky. It is not unusual for buildings in that region to skip the number 4 when labeling floors, much in the same way 13th floors are omitted in some parts of the world2. In Hong Kong, at least one skyscraper avoids the proper numbering for floors 40-49. Four is the smallest positive non-prime number3. It is the only natural number where one can get the same result by multiplying its square roots (2×2), or adding them (2+2). Four happens to be the only number that has the same number of letters as its actual value4. The four color theorem tells us that four is an adequate number of colors for any two dimensional map–no two bordering regions would need to share a color. Four is the number of bonds that a carbon atom can make, which is why life can exist, a quality known as tetravalency. Fear of the number four is known as tetraphobia, and anyone suffering from it has almost certainly stopped reading by now, or at least uttered some four-letter words. It’s no secret that direct donations to Damn Interesting have been on a downward trend in recent years, so we are aiming to diversify. To that end, we’ve made something new, and it’s called Omiword. Continue reading ▶
Edmund Lawall must have felt cursed. He’d brought his family to New York in the late 1800s to carry on his father’s business as a pharmacist, but fate—or perhaps the city itself—seemed determined to drive him back out again. Lawall’s health had been in decline since their arrival, and his wife’s kidney disease had worsened, despite all of the tinctures and patent medicines available to his turn-of-the-century expertise. Not long after that, his business partner had been revealed as a crook, sending Lawall scrambling into bankruptcy court to convince the judge that his pharmacy had nothing to do with shady real estate dealings. Then, in the midst of the bankruptcy proceedings, an anonymous woman had staggered into Lawall’s drug store, collapsed on the floor, and died of unknown causes. Likely no one could have saved her, but it wasn’t exactly a ringing endorsement of the pharmaceutical services available at the corner of Eighth Street and Avenue C. None of that compared, however, to the morning of 27 June 1906, when a disheveled man in a medical coat burst through the narrow glass doors of the pharmacy, begging for protection. He was immediately followed by a young man with a revolver, and an angry crowd screaming in Yiddish. Lawall didn’t speak the language, but there was no mistaking the young man’s intent as he strode purposely forward and raised his gun to the doctor’s head. It was a grim, but recognizable tableau: the young man’s stance and grip were confident, clearly marking him as a budding gangster. The behavior of the crowd, on the other hand, made no sense at all. Innocent bystanders tended to run away from gang violence, yet the pushcart vendors and housewives surrounding the apparent holdup were not frightened, or even appealing for mercy. They were shouting, quite insistently, for the doctor’s execution. And everything seemed to indicate they were going to get what they wanted. In the weeks that followed, blame would be pointed in nearly every direction—because at that moment, unbeknownst to Lawall, similar scenes were playing out all over the neighborhood, with other doctors, teachers, reporters, and even utility workers being assaulted by hordes of people howling at them in Yiddish. By the time it was over, the incident would be measured as one of the largest riots ever in New York City, and the confrontation at Lawall’s Pharmacy would be mentioned only in passing, if at all. Another name, however, would be repeated over and over again: Adeline E. Simpson, the principal of Public School No. 110. Continue reading ▶
Iceland is known to the rest of the world as the land of Vikings and volcanos, an island caught between continents at the extremities of the map. Remote and comparatively inhospitable, it was settled only as long ago as the 9th century, and has seen little additional in-migration since. Even today, more than 90 percent of Iceland’s 390,000 residents can trace their ancestry back to the earliest permanent inhabitants, a Nordic-Celtic mix. The tradition of the Norse sagas lives on in the form of careful record-keeping about ancestry—and a national passion for genealogy. In other words, it is not the place to stumble upon old family mysteries. But growing up in the capital city of Reykjavík in the 1950s, neurologist Dr. Kári Stefánsson heard stories that left him curious. Stefánsson’s father had come from Djúpivogur, an eastern coastal town where everyone still spoke of a Black man who had moved there early in the 19th century. “Hans Jónatan”, they called him—a well-liked shopkeeper who had arrived on a ship, married a spirited woman from a local farm, and became a revered member of the community. The local census did record a man by the name of Hans Jónatan, born in the Caribbean, who was working at the general store in Djúpivogur in the 19th century—but that was all. No images of the man had survived, and his time in Iceland was well before any other humans with African ancestry are known to have visited the island. If tiny, remote Djúpivogur did have a Black man arrive in the 19th century, the circumstances must have been unusual indeed. It was an intriguing puzzle—and solid grounds for a scientific investigation. Given the amount of homogeneity in the baseline Icelandic population, the genetic signature of one relative newcomer with distinct ancestry might still stand out across a large sample of his descendants. Geneticists thus joined locals and history scholars, and they pieced together a story that bridged three continents. Continue reading ▶
It’s been a busy summer, and the large shortfall in donations last month has been demoralizing, so we’re taking a week off to rest and recuperate. The curated links section will be (mostly) silent, and behind the scenes we’ll be taking a brief break from our usual researching, writing, editing, illustrating, narrating, sound designing, coding, et cetera. We plan to return to normalcy on the 11th of September. (The word “normalcy” was not considered an acceptable alternative to “normality” until 14 May 1920, when then-presidential-candidate Warren G. Harding misused the mathematical term in a campaign speech, stating that America needed, “not nostrums, but normalcy.” He then integrated this error into his campaign slogan, “Return to Normalcy.” Also, the G in Warren G. Harding stood for “Gamaliel.”) While we are away, on 06 September 2023, Damn Interesting will be turning 18 years old. To celebrate, here are the first emojis to ever appear in the body of a Damn Interesting post: 🎂🎉🎁 If you become bored while we are away, you might try a little mobile game we’ve been working on called Wordwhile. It can be played alone, or with a friend. If you enjoy games like Scrabble and Wordle, you may find this one ENJOYABLE (75 points). Launch Wordwhile → And, as always, there are lots of ways to explore our back-catalog. View this post ▶
More in science
Episode four of the Works in Progress podcast is about land.
For decades, mathematicians have struggled to understand matrices that reflect both order and randomness, like those that model semiconductors. A new method could change that. The post New Physics-Inspired Proof Probes the Borders of Disorder first appeared on Quanta Magazine
Maybe we’re thinking about all of these papers the wrong way
In “Amazon Tipping Point” — Third-Place Winner of the 2025 Yale Environment 360 Film Contest — Brazilian filmmakers capture striking images of clear-cutting and explore how human activity is so damaging the world’s largest rainforest that it will not be able to recover. Read more on E360 →
This is an interesting story, and I am trying to moderate my optimism. Alzheimer’s disease (AD), the major cause of dementia in humans, is a very complex disease. We have been studying it for decades, revealing numerous clues as to what kicks it off, what causes it to progress, and how to potentially treat it. […] The post Lithium and Alzheimer’s Disease first appeared on NeuroLogica Blog.