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TIL a 1979 study from Kays Kaidbey and his colleagues found that on average 55% of ultraviolet A rays penetrate Caucasian skin while fewer than 18% get through African-American skin. This is why photoageing is delayed in people with dark skin...

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XEvRD TIL that in 2019, A&W became the first franchised restaurant chain to turn 100 years old
eOmn TIL: Squirrels cause seventeen percent of fiber optic cable cuts
bBd0 TIL that there is a town in New York that voted to secede from the Union in 1861, and did not formally rejoin until 1945.
YKRx TIL that for a large amount of time, Michael Jackson owned all the rights to songs written/produce by the Beatles. Also, McCartney and Ono will gain rights to Beatles songs in 2018, and full rights in 2026.
5Vlxp TIL about trailer buses. An engineless trailer either carried by a semi truck or another bus which itself is used as a bus. It was often used throughout history as a temporary cheep alternative to normal buses. These buses are still used (albeit very rarely) in some places on earth.