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TIL A cow is not a cow until it has had at least one calf. Until then it is called a heifer.

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1xy7 TIL King Arthur had a brother called Madawg
eGR4 TIL that a molten-salt reactor, a piece of technology conceived during the Cold War that forgoes solid nuclear fuel for a liquid one, can generate energy with far greater efficiency than any power technology in existence.
KOGaa TIL of Marthe Cohn, a French holocaust survivor who served as a spy for the French army. In November 1944, she manipulated a SS officer into divulging the location of the Germany army, allowing the allies to avoid a major ambush. At 100, she is still alive today.
R7Yy7 TIL in the early 20th century, if a policitician died, he would be replaced in office by his widow
M7YwB TIL that Hitler ensured the safety of his Jewish family doctor Eduard Bloch (who treated Hitler's mother for breast cancer at reduced cost). He was allowed to emigrate to the US in 1940.