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TIL Richard Feynman made one mistake in his Feynman’s Lectures book and one student got her answer wrong in a exam. To her Feynman wrote “In science, believe in logic, not in authorities; I goofed and you goofed it too for believing me”

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4keWN TIL While the Confederacy used the strongest cipher available during the Civil War, the Vigenère cipher, the Union consistently cracked it. This was because the Confederates only ever used three key phrases: "Manchester Bluff", "Complete Victory" and, as the war came to a close, "Come Retribution".
7rEax TIL in 1917 the Aerowagon experimental high-speed railcar used an aircraft engine and propeller traction to go 140 kph (87mph) to carry Soviet officials. In 1921 officials successfully went from Moscow to Tula. On return it derailed at high speed killing 6 of 22 on board including the inventor.
8aWL4 TIL three 13 year old girls submitted a script for "Tiny Toon Adventures". Producer Steven Spielberg was so impressed that he invited the girls to Hollywood to work on the episode and paid them $3,000. This later inspired a Simpsons episode where Bart and Lisa write an Itchy & Scratchy cartoon.
rNVPM TIL about the coprophagous sloth moth - a moth that lives its entire life on sloths and eats its feces in the larval stage.
PYEWe TIL Kangaroos have tremendous endurance. In other animals metabolic rate increases with speed, but it levels off once Kangaroos start hopping due to the efficiency of elastic recoil.