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TIL that one of the most effective weapons in WW2 was the proximity fuzed shell: the allies were so terrified of the enemy getting hold of samples they were initially only to be used over water by the Navy - there was an embargo on their use over land until 1944.

Read more historynet.com

via reddit.com

DQO1V TIL that Natalie Portman has had papers published in two scientific journals. While at Harvard, she co-authored a study called “Frontal Lobe Activation during Object Permanence: Data from Near-Infrared Spectroscopy.”
VeBZ TIL a man with cerebral palsy was forced to crawl off of his flight when United Airlines staff failed to provide him with the proper assistance.
YpgMx TIL that 620 million years ago there were only 21.9 hours in a day, and 400 days in a year.
rRR1y TIL many schools in Japan require students to have black hair. Those with other hair colors are often pressured to dye their hair by a rule intended to prohibit dying of hair.
XEZwk TIL about “sheep dipping,” a practice known in intelligence circles where a member of the Army is “officially discharged from service” as a part of their covert cover, while in secret, are still eligible for rank promotions and military benefits.