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TIL that in humans, the nasal cycle means that during the course of a day, the nostrils will switch over approximately every four hours or so.

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DQ1lg TIL amidst early concerns about leaded gas, the engineer who discovered tetraethyllead as an additive demonstrated its 'safety' by pouring it over his hands and inhaling its vapor, stating he could do this every day without issue. He later took a leave of absence due to lead poisoning.
J1wVv TIL Lockheed Martin have filed for a patent on a small fusion "engine" intended to provide propulsion for a future aircraft design. "Provided herein are various leptonic power sources, leptonic control systems, and leptonic-powered engines."
OGL01 TIL that when the Washington monument was built the capstone was made out aluminum because it was considered a precious metal at the time.
vPa1R TIL of the Niland brothers, four brothers from New York who fought in World War II. Two died in combat, one survived, and one was believed to be dead but actually survived the war and was held in a Japanese POW Camp in Burma. Their story served as the inspiration for Saving Private Ryan.
woNZ7 TIL We don't have to raise our hand to knock the door