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TIL In 2019 a Japanese University student studying ninja history turned in an essay written in invisible ink. The words only became visible when the paper was heated over a gas stove. Her professor without even revealing the whole essay gave her an A.

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via reddit.com

gnK9 TIL there was hundreds of thousands of Irish slaves and it wasn’t just African slaves.
R7XVa TIL that in January 2005, the US Navy’s submarine, USS San Francisco, traveling at full speed under 525 feet of water hit an uncharted undersea mount, resulting in one death and many injuries.
9wYrQ TIL learned that the US has a series of caves stockpiling 1.4 BILLION pounds of surplus cheese.
Aajw TIL that the fighter squadron with the highest number of kills in the Battle of Britain during WWII were actually from Poland, and showed up two months after the battle had begun.
nexo TIL the real boss of the DiMeo/Soprano Crime Family from The Sopranos was Ericole DiMeo, who is incarcerated for the duration of the series, never appears on-screen, and is only mentioned in five episodes. Jackie Aprile, Junior, and Tony were only acting bosses.