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Crested pigeons have specialized feathers that signal danger when they flee from an apparent threat.

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YAQr TIL the BBC ran a contest asking vacationers for pictures of French beaches prior to D-Day to help gather intelligence and determine whether the beach was suitable for an amphibious landing.
nmZr TIL that pre-ejaculatory fluid (“Pre-cum”) is released from a different part of the anatomy of the penis (than sperm) and is meant to lower the acidity in the vagina before ejaculation and most studies are in agreement that it CANNOT get someone pregnant.
yQ8bM TIL When famed troll and philosopher Diogenes the Cynic was being sold as a slave, he listed his speciality as "ruling men." He subsequently pointed to Xeniades, a wealthy Corinthian and said, “Sell me to this man; he needs a master.” He was sold on the spot and became a tutor to Xeniades's sons.
a8xDb Today I learned that horses can swim. Large lungs keeps them afloat and they swim similar to dogs by paddling with all 4 limbs.
oJe8 TIL That psychologists and psychiatrists were nearly required to dress as prototypical wizards before testifying in New Mexican courts.