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TIL Medieval Castles went up in a clockwise spiral to give defenders a sword fighting advantage

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X01wj TIL that American rockets are often equipped with a self-destruct system to protect people if the vehicle goes off course. Since 1958, 33 US orbital launch attempts have ended by self-destruction.
W7pn8 TIL starting a new exercise regimen makes it more likely for you to experience hot flashes - especially if you are a young woman
Oov47 TIL: That the Netherlands Flood Defense System includes 2 of the 7 Wonders of the Modern World. Dutch government spends >1BN euro/yr ensuring that its extensive system of dikes/dams/levies are held to a standard of 1 flood every 10,000 years, this includes depositing 3.1bn gallons of sand on shores.
4XkwR TIL all New Orleans public schools were closed indefinitely in the wake of Katrina and students now attend private or public charter schools.
N7bb6 TIL FDR's White House housekeeper, Henrietta Nesbitt, was a legendarily awful cook. “Of course Henrietta did not personally do the cooking,” wrote a former WH maid, “but she stood over the cooks, making sure that each dish was overcooked or undercooked or ruined one way or another.”