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TIL opossums always give birth to an odd number of babies, because they have an odd number of nipples. All other mammals have typically have an even number of both.

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lXK1 TIL A 2008 study found that fast food hamburgers were made up of only 12% meat. The rest was water weight, bone, cartilage, plant matter, and parasites.
69WyW TIL about the Chambers flintlock machine gun designed in 1792, presented to Washington and Jefferson, and tested by Hamilton and formally adopted in 1812 by the US navy.
8aJWL TIL Marshmello made a colab with Disney and made a Ducktales music video.
oROd7 TIL that the Great Wall of China was not built as a single continuous wall, but rather as a series of walls and fortifications constructed by various dynasties over centuries. The most well-known sections were built during the Ming dynasty (1368–1644).
4Xbyb TIL wallets weren't used for carrying money and identification like they are now. They carried things like dried meats and "things to be unseen". It was also considered uncivilized to carry your wallet in your pocket up until the 20th century.