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TIL in 2001, while performing the song "Two Step," Dave Matthews sang the words "Let it rain" and immediately the crowd was poured on by a violent rain and hail storm, which did not stop until the song concluded. This performance has now been called "Two Step in the Rain."

mx0DM TIL Usain Bolt suffered from scoliosis when he was younger and has an asymmetrical stride when he runs because his legs are slightly different lengths. Researchers aren’t sure if this lack of symmetry is a personal mechanical optimization by Bolt that makes him the fastest human or not.
eNP6 TIL when you get a sunburn, it’s not your skin cells being damaged by the sun and dying, it’s your skin cells’ DNA being damaged by the sun and them killing themselves so they don’t turn into cancer
1vxD TIL that in May 1959, when Billie Holiday was taken to Metropolitan Hospital in New York with liver and heart disease, she was arrested for drug possession as she lay dying. Her hospital room was raided by police and she remained under police guard until her death in July.
GAWbG TIL there is a genetic disorder many people have with something called Lipoprotein (a), and it puts people at high risk of heart disease, heart attack, stroke, and aortic stenosis. It’s 100% genetic, can’t be corrected, and can only be treated with aggressive cholesterol control.
wERM TIL Aircraft black boxes are designed to be able to withstand the pressure of being a mile underwater for up to 30 days. In the case of the Airbus box on Air France 447 it spent over 2 ½ years at over 3 miles deep and was still able to determine the cause of the accident.