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TIL that the hexagonally shaped mirror segments of the James Webb telescope can each move 1/10,000th the diameter of a human hair in order to accurately focus on deep space.

Read more webb.nasa.gov

via reddit.com

wBJ7 TIL that there are 3000 cities with worse lead levels in their water supply than Flint, MI
P1KwE TIL that in 1933, the state of Western Australian voted by a clear majority to secede from the Australian Federation, but at the same time, voted out a pro-seccessionist Premier in favour of the anti-seccession candidate. Efforts to implement secession were ultimately complex and unsuccessful.
enmJ TIL the first webcam was deployed at Cambridge University computer lab – its sole purpose was to monitor a particular coffee maker and hence avoid wasted trips to an empty pot.
wEjY TIL that hand-warmers are filled with iron, and the heat comes from the process of the iron turning into rust when exposed to oxygen
b4a4 TIL the worlds first successful penis transplant patient had it removed 2 weeks later due to his wife’s “psychological rejection”