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TIL that Stephen Hawking and Mark Zuckerberg collaborated in founding the Breakthrough Starshot program, which aims to develop a proof-of-concept fleet of interstellar probes capable of reaching Alpha Centauri.

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0wp15 TIL that iPhones bought in Japan (and seemingly also South Korea) cannot be muted when using the camera, to avoid creeps taking covert photos and similar
OG8G6 TIL: The first quantitative estimate of the speed of light was done in 1676 by timing eclipses of Jupiter's Io.
QJpla TIL In 1998, Sergey Kiriyenko became the youngest Prime Minister of Russia, at the age of 35 years
0w0Pp TIL of the St. Francis Dam disaster of 1928. Located in Angeles National Forest, the reservoir held 12 billion gallons of water. The dam failed before midnight on March 12th. A 140 ft flood wave swept debris and bodies 54 miles to the pacific ocean. Second worst loss of life in California history.
mRYO TIL in feudal hierarchy of Japan, merchants were the lowest class because unlike farmers and artisans, they don’t actually produce anything. Samurai warriors were in the topmost class.