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TIL Tree DNA was used in US federal court to connect a log poacher to the stump of the tree he illegally cut down and that now volunteers are working on creating tree DNA databases for future prosecutions.

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W7omX TIL Astronomer Edward Barnard discovered Amalthea, the fifth satellite of Jupiter, using an eyepiece that yielded 520x on the 36-inch Lick Observatory telescope. Barnard observed Saturn's moon at 2,600x at the highest but 1000x power is enough to show a disk
j6AJp TIL that the DSV Limiting Factor, a submarine that is used to dive into the deepest point of Earth, is owned by Valve's (makers of Steam, a PC gaming storefront) Gabe Newell.
NXPPP TIL of Gacek the Cat, a chunky tuxedo cat who happens to be the highest rated tourist attraction in the town of Szczecin. Tourists from all around the world come to feed him snacks
R5kN8 TIL about the Zimmermann Telegram, a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico if the USA entered World War I against Germany. The telegram was intercepted by British intelligence.
Z8pkp TIL that by law, no United States officer can outrank George Washington. He was posthumously promoted to Six-Star General in 1976.