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TIL That Robert Todd Lincoln, son of Abraham Lincoln, was present for three of America’s four presidential assassinations (Lincoln, Garfield, McKinley)

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xp11 TIL that the SR-71 was able to maintain its heading within 1,000 feet at Mach 3 by using a navigation system that tracked a series of 61 stars using a sensor capable of detecting them in broad daylight.
VEXm TIL Ants can get stuck in a circular pheromone trail, causing the entire colony to pinwheel forever until death.
6EBKY TIL about the origin of the term “decimation”. It was a punishment in the Roman Army where soldiers were spilt into groups of 10, straws were drawn and whoever drew the short straw was clubbed, stabbed or stoned to death by the remaining 9. The first recorded instance of this is from 478 BC.
Lkgnp TIL pirates did not wear eye patches due to a missing eye. They wore eye patches to be able to see above and below decks.
XEMwE TIL On average, genetic similarity between any two humans is 99.9%. There is about 2–3 times more genetic diversity within the wild chimpanzee population, than in the entire human gene pool.