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TIL nacreous clouds, also known as polar stratospheric clouds, are often visible in polar regions during winter. These rare clouds form at high altitudes in the stratosphere, about 15 - 25 km above the Earth, their stunning colors are caused by the diffraction of sunlight through tiny ice crystals.

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P19EL TIL about the forced expulsion of the Chagossians, when the UK, at the request of the US, began expelling the native inhabitants of the Chagos Archipelago in 1968. The entire population of the Chagos was removed to Mauritius and the Seychelles by 1973
8ewg8 TIL that in the 1980s, Tom Fogerty, rhythm guitarist for Creedence Clearwater Revival, underwent back surgery, and was given a blood transfusion that was not screened for HIV causing him to become infected with the virus. He later contracted AIDS and died from tuberculosis.
v97L TIL that because of the electoral college, a presidential candidate can win with only 23% of the popular vote.
7rAbb TIL that Julia Tuttle was the only woman to found a major American city, having owned and developed the land that would eventually become Miami.
l79aA TIL the Bantu term "Mzungu" (a derogatory for White people) originally meant "wanderers" and referred to European explorers.