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TIL Rubbing your eyes increases the pressure within the eyeball and this pressure activates ganglion cells in the retina in the same way as light does. Your brain doesn’t know the difference and so interprets the activation as though you were seeing light from the world outside.

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P1JlL TIL that abolitionist John Brown’s attack on the Harper’s Ferry Armory was suppressed by Colonel Robert E. Lee.
x6AQB TIL The oldest flamingo lived to be 83. It arrived at Adelaide Zoo in Australia in 1933 and died in 2014.
a8OeM TIL about Edgardo Greco, an italian mafioso who beat two rival gang members to death and fled to France to escape law enforcement. He went on to become a successful pizzeria owner before getting caught more than 30 years later after posing for a newspaper featuring his prized restaurant.
PYLLV TIL that a major reason Florida appears to have so many crazy people is that the state's transparency laws give the media access to all arrest reports.
Y7gXW TIL about Operation Cherry Blossoms at Night (or Op PX). It was a biological attacked plan by the Imperial Japanese Navy to use seaplanes to deliver weaponized Bubonic Plague to the Western Coast of United States. The plan was abandoned and briefly reconsidered after the Japanese surrender to US.