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TIL Roman salt-making entailed boiling the seawater in large lead-lined pans. Salt was used as currency in ancient Rome, and the roots of the words "soldier" and "salary" can be traced to Latin words related to giving or receiving salt.

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Eg47w TIL Tom Lehrer, Mathematician, Musician, and Satirist also invented the Jello Shot while serving on a military base
5VYLQ TIL The space probe Voyager 2 looses about 4 watts of power annually due to natural decay of its nuclear fuel.
v1wOx TIL that the ITER fusion reactor is scheduled to be switched on in 2025, but it will take 10 years from that point to reach fusion.
Eg1K7 TIL that until the 16th century, sharks were called "sea dogs", the word "shark" most likely comes from the Dutch schurk, meaning "scoundrel", from which "loan shark" derives. In other words, sharks are probably named after loan sharks and not the other way around.
1Zw7 TIL there is a scientific term for a person’s tendency to modify their behavior when they know they’re being observed. It’s referred to as the Hawthorne effect.