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TIL about Low-background steel, any steel produced prior to the detonation of the first nuclear bombs in the 1940s and 1950s and now typically found in shipwrecks. It is often used for modern particle detectors because more modern steel is contaminated with traces of nuclear fallout.

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5VMvn TIL: Imigrants are less likely to commit crimes in the United States. It has been this way for over 100 years.
D1nQr TIL that some unmanned spacecraft don’t have colour cameras because they get a higher resolution if it’s black and white and because less information had to be transmitted, thus saving the space crafts power supply and is significantly deceases the time it takes to transmit the data back to earth.
mx4ZP TIL there is a family of birds called Honeyguides that are known to lead humans to beehives. The Honeyguides eat the discarded grubs and beeswax once the humans have taken the honey.
78QQX TIL there was a time when 6 geologists were convicted of manslaughter for failing to predict a deadly earthquake in Italy in 2009. They were later exonerated but faced high levels of shame from the general public afterwards.
m1YMM TIL that Vince Guaraldi, the jazz pianist best known for composing music for animated television adaptations of the Peanuts comic strip, including their signature melody "Linus and Lucy" was a friend of the Grateful Dead, was on one of their album covers, and even sat in with the band.