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TIL about Project Plowshare which was a U.S. government program from 1957 to 1977 which sought to develop peaceful uses for nuclear explosives which included rock-blasting, creating new elements, studying nuclear physics, and gathering geological and Earth science data.

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D1X9J TIL about a house made from the tombstones of 2,200 soldiers
epkG6 TIL that natural disasters increase fertility rates
ggkW TIL in medieval castles, stairwells ran clockwise, so attackers coming up the stairs had their sword hands (right hand) against the wall’s interior curve which made it hard for them to swing their swords. Defenders had their swords on the outside wall, which meant more room to swing.
KxKJ TIL that after a 1946 plane crash, Howard Hughes decided he did not like the design of the hospital bed he was laying in. He called in his engineers and had them design a new bed that would allow someone with severe burns to move freely. It became the prototype for the modern hospital bed.
Oo6oY TIL that Nintendo's Mario takes his name from Mario Segale, the landlord of Nintendo's American Headquarters in Seattle. After coming into the warehouse to berate Minoru Arakawa for late rent, the game developers changed the name of their main character from "Jumpman" to Mario.