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TIL Cats have been blamed for the global extinction of 33 species

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b9PN0 TIL that our eyes will usually dilate when we see shocking, threatening images, unless if you're a psychopath
VMayG TIL that the 1992 film "American Me" enraged Mexican gangsters to the extent that numerous people involved with the film were murdered. Danny Trejo claimed 10. Edward Olmos, the director of the film, was also the victim of an extortion plot.
waeP TIL Lacrosse, as originally played by Native Americans, fielded teams from 100 to 1,000 men, with goals 500 yards to 6 miles apart, with games lasting several days, played sunup to sundown. These games tended to become huge mobs of players swarming the ball and slowly moving it across the field.
YppZG TIL many EXIT signs contain a radioactive isotope of hydrogen, tritium gas. This allows for radioluminescence, which makes the sign glow as a result of low-level beta radiation from the tritium decay.
j6VyM TIL Mugger crocodiles & American alligators use tools: they collect sticks, partially submerge themselves, balance the sticks on their head, & when a bird approaches to take a stick for its nest, they spring their trap. This strategy is the first known case of a predator using an object as a lure.