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TIL the Great Sphinx was so named about 2000 years after its construction. What name the creators called their statue is unknown and there are no inscriptions anywhere describing its construction or original purpose.

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gM9y7 TIL A college math professor wrote a fantasy "novel" workbook to teach the fundamentals of calculus. Concepts are taught through the adventures of a man who has washed ashore in the mystic land of Carmorra and the hero helps people faced with difficult mathematical problems
R74bw TIL that the myth that Spinach is good for low Iron (it actually prevents the body from absorbing it) was caused by a decimal point error in the 1930s that declared it had 10x the Iron concentration of other vegetables (it's average at best)
R57A8 TIL about President Risto Ryti of Finland who, in exchange for military and food assistance during WWII, promised Germany he would fight the Soviet Union. Germany provided the supplies, and Ryti resigned, allowing his successor to seek peace with the Soviets.
0wY7p TIL that Häagen-Dazs is an American company, started by two Jewish brothers in the Bronx. “Häagen Dazs” are nonsensical words invented to sound Danish because the brothers wanted to pay tribute to the Danish treatment of Jews in WWII.
OGo5X TIL there is a species of bird that has only been found once. A Red Sea Cliff Swallow was found in Sudan in 1984, and a second bird of this species has never been found. There is not enough conclusive evidence to say it matches any other species of swallow, so it is still listed as its own species.