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TIL that “The Stars and Stripes Forever” is onown as “The Disaster March” at circuses, because it is only ever played to signify an emergency without alarming the audience.

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d8bx9 TIL the glass of airplane windows block out UVB rays to prevent passengers from getting a sunburn.
lvOa TIL a Brazilian man in the UK, misidentified as a terrorist, was shot point blank in the head 7 times, whilst on the ground; by plain clothed police officers. No one was punished.
nObY TIL that Lactase Persistence, the ability of humans to digest milk as an adult, is only common among Europeans and those of European ancestry, as a unique mutation. Most of the global population, including 90% of Asians and 100% of Native Americans, have some degree of lactose intolerance.
D1r7r TIL there is a species of weevil named after baseball player José Bautista
wLZE1 TIL Bill Gates predicts that the growth of instructional software will replace textbooks. However, in a 2018 survey of college students, the trade publication Library Journal found that 75 percent say that reading print books is easier than e-books