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TIL that sometimes a group of ants will get separated from their main foraging party and begin to follow each other in a continuously rotating circle. Eventually they all die of exhaustion. This phenomenon is called an “ant mill”.

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P1ZlL TIL that in 2008, a gamma ray burst was observed from 7.5 billion light years away. It was visible with the naked eye for about 30 seconds, and if viewed from the same distance as the sun it would be 21 quadrillion times brighter.
QNbwa TIL that when determining the atomic mass of each chemical elements, the English chemist William Prout deduced that the building block of the atom is primarily the atom of Hydrogen. Though Prout’s hypothesis was not entirely accurate, because atom's building block is the proton.
wLNDo TIL The meaning behind Apple logo isn’t actually meant to pay tribute to Alan Turing, rather, it was for a practical purpose: scale. The size of the bite showed that the shape was an apple, not a cherry or any other vaguely round fruit.
N7Ww6 TIL during the Golden Age of Piracy, women sometimes became pirates by disguising themselves as men in an effort to take advantage of freedom and rights that men could only enjoy. Anne and Mary were two famous female pirates of that time who fell in love with each others' disguised manly appearance!
VMKX0 TIL that geese are one of the oldest groups of birds, having changed very little from the age of the dinosaurs. Relying on water for food and burrows for nesting is thought to have played a big part in surviving the K-T extinction.