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TIL Physicist Richard Feynman memorized pi up to the 762nd digit, where there are six 9’s in a row, just so he could joke, “…9, 9, 9, 9, 9, 9 and so on…”. For this reason, this sequence of 9’s is named the Feynman Point.

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7rG8x TIL during the German invasion of the USSR in WW2, Nazi forces captured Stalin's son, Yakov Dzhugashvili. When the Nazis proposed exchanging him for their captured field marshal Frierich Paulus, Stalin retorted "I will not trade a marshal for a lieutenant." Dzhugashvili was later executed in 1943.
ZpG9D TIL: Holy water in a container can be topped up with unholy water. As long as the added water doesn’t exceed 50%, the whole container is still considered holy water.
DPne TIL there’s a game that makes you make decisions as though you were a single parent with only $1,000 left and most people don’t get past 11 minutes into it
J1R4B TIL that in Old English "deer" described any animal. As language evolved, the meaning changed and narrowed until it started to describe only one type of animal. It's a change unique to English and Scots, as "deer" (tier, djur, dyr, dier, etc.) still means animal in all other Germanic languages.
9Y6Zm TIL Dr. Seuss cheated on his wife who had cancer. After his wife killed herself, after finding out about the affair, Dr. Seuss married his mistress