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TIL “Low-background steel” is steel made before the first nuclear bomb tests in the 40’s because modern steel is contaminated with radionuclides because its production used atmospheric air

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wMR8 TIL there is a proposed HTTP status code 451 indicating censorship, referencing Ray Bradbury’s Fahrenheit 451 novel
78OaP TIL About How, in the 18th Century, over 700 children were kidnapped from the streets of Aberdeen and sent to North America and sold as slaves.
VBGv8 TIL gas clouds in the universe are detected by not only their emission but also their absorption of starlight. The absorbed wavelengths depend on the elements and compounds in the cloud, as explained by quantum mechanics, allowing us to determine their composition through absorption lines.
yQgo8 TIL Coco Chanel, famous fashion designer, was a Nazi sympathizer and agent
OZva TIL knife manufacturer, Victorinox, claims never to have had to lay off an employee. To avoid this they set aside profits during boom periods to supplement recessionary periods, as well as temporarily contracting employees to other companies as outsourced labour during recessions.