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TIL America has the highest teen pregnancy rates of any nation the developed world. Within America, Mississippi has the highest rates. Every single county in Mississippi has a teen birth rate higher than the national average.

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9P8X TIL the Jay Treaty of 1794 between the U.S. and England so angered the French that they did not invite the U.S. to the Convention du Mètre, which is cited as a major reason why the US is not on the metric system.
6Emb8 TIL that Chimpanzees, Elephants, and Magpies all mourn their dead and feel some sort of grief.
864G TIL The microscopic structures of dried human tears differ according to the type of crying:the molecular structure of tears of grief are different from tears of joy.
Lkjv9 TIL That the first bicycle was invented during a famine caused by a Indonesian vulcanic eruption in 1815. Horses were eaten during the famine, so there were fewer of them to be used as a means of transportation.
vJDB TIL of Franz Stigler, a German ace fighter pilot who risked his life to spare and then save the lives of 9 Americans by escorting their injured B-17 bomber out of Germany. The incident would later be called “the most incredible encounter between enemies in World War II.”