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TIL that when crowds get as dense as 6 or 7 people per square meter, they begin taking on the characteristics of fluids. This can lead to "crowd crushes," where waves propagate through the group and push people into tight spaces, crushing them to death.

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rNL4 TIL A butler, trained at one of a small number of specialized butlering schools, can expect to earn a starting salary of $50,000-60,000 per year upon graduation.
6El87 TIL about the windshield phenomenon, the observation that since the early 2000s people often no longer have to clean a bunch of insects off the windshields of their cars after a long drive. It has been attributed to a global decline in insect populations because of human impact on their ecosystem.
GA594 TIL Victoria Drummond was the first female maritime engineer and served on various commercial vessels. During WWII, an old freighter she served on came under attack by German bombers. She managed to exceed the old top speed of the ship by 50% during the attack, which helped with evasive maneuvers.
Y7L7P TIL: Panama is the only place on the planet that has square trees- even the transplanted trees from the square trees grow round as usual when planted in other places outside of Panama. And the “rings,” of the interior tree grow in a square shape, rather than the usual circle, making it truly unique.
5yAQ TIL those making less than $10,000 a year spend $597 on the lottery meanwhile the average US household spends $162. States not only know this; they actually target the poor with lottery ads.