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TIL NASA used 3D printing to make rocket engine injector, cutting manufacturing time from 1 year to 4 months and cuts costs by 70%.

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E1gYd TIL Many appliances have a ‘Sabbath Mode’ to allow them to be used by Shabbat-observant Jews on the Shabbat and Jewish holidays.
wL49o TIL that people called "Searchers of the Dead" worked in 16th century London, examining corpses to determine whether they died of plague. Mostly elderly women, they often died of the diseases they were searching for.
0dg7R TIL: Kodak's "Shirley Cards" was used as a standard for skin tone in photography.
7rwxX TIL in the UK it's musician union rules that for every actor or model playing an instrument in a music video, the production still has to pay an actual musician. In the iconic "Addicted to Love" video not only they paid the 5 'fembot' models but also 5 musicians behind camera miming the models.
Y7Dnx TIL that not all male mammals have external testicles. Those mammals with internal testicles don't just include sea mammals, but others such as elephants.