› added 9 years ago

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TIL some military vehicles are equipped with an multi-microphone system called a “boomerang” that can locate the direction of enemy gunfire as well as the shooter’s range and azimuth (elevation) after the first shot.

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QJM9a TIL that Andrew Carnegie and John D. Rockefeller, two wealthy extremely entrepreneurs, sent each other gag Christmas gifts. Rockefeller sent Carnegie a cardboard vest to make fun of his poor childhood. In return Carnegie sent a fine whiskey to Rockefeller, a devout baptist who had given up drinking.
kK8W TIL that Leonardo da Vinci designed a scuba suit.
b9RV4 TIL of Grigori Perelman, a Russian mathematician who proved the Poincaré conjecture (one of the Millennium Prize problems). He later quit his job, turned down the $1 million prize as well as the Fields Medal, and is thought to have withdrawn from the field of mathematics entirely.
d84l8 TIL Before 1972 it was a felony for unmarried people to possess contraception such as birth control or condoms in the United States.
Oo1Wg TIL goats have rectangular pupils. This grants them panoramic vision which can detect intruders approaching from various directions.