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TIL Dr. Lazarus' catchphrase, "By Grabthar's Hammer..." from Galaxy Quest (1999), was written as a temp line in the script. The plan was to replace "Grabthar" with something less comical, but the line stuck as the production crew started using it around their offices and had it printed on t-shirts.

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MeLAW TIL soundtracks to movies were included as “optical sound” on the edge of film reels starting in the 1920s. Usually the density or width of the signal was read by a photodiode and turned into sound with some delay to match the picture on the screen.
j61YQ TIL the hymn 'Amazing Grace' was written by an ex-slave ship captain and slave trader. After finding Christianity later in life he turned his back on the trade and became a prominent supporter of abolitionism. He was also held as a slave himself before escaping.
eJEL TIL that most energy drinks contain Taurine. The same amino acid that cats require in the diet to prevent them from going blind.
N767b TIL a Venus flytrap can count the number of times its victims touch the hairs on its leaves. One touch does nothing, two closes the trap, three primes the trap for digestion, five triggers the production of digestive enzyme. So, victims tell the plant to start killing it and how vigorously to do so.
4meJ TIL of bank robber McArthur Wheeler. Because lemon juice can be used as invisible ink, Wheeler (wrongly) assumed that putting it on his face would make him invisible to the bank’s security cameras. He was caught later that day.