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TIL Dust in homes is composed of about 20–50% dead skin cells

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VBLB4 TIL about the atlantropa, a gigantic engineering and colonisation idea that was devised by the German architect Herman Sörgel in the 1920s, and promoted by him until his death in 1952. The project was devised to contain several hydroelectric dams in key points of the Mediterranean Sea.
69QEZ TIL: Over the course of 100 years, the amount of Black-owned farmland dropped by 90%, according to Data for Progress, due to higher rates of loan and credit denials, lack of legal and industry support and "outright acts of violence and intimidation."
M7E7b TIL that in 1800, the U.S. birthrate was higher than in any European nation. The typical woman bore 7 children, starting around age 23 and continuing in two-year intervals until menopause. Had this pattern continued, the U.S. population would have reached 2 billion by 1990.
W7jLN TIL the cracking sound created by a bullwhip is a sonic boom, the sound created when an object moves faster than the speed of sound. The whip is most likely to be the first faster-than-sound manmade item.
rR1Me TIL when the head of Universal Studios saw a film by a young student named Steven Spielberg, he called him in for a meeting, offered him a 7-year contract and told him, "a lot of people will stick with you in success; I’ll stick with you in failure."