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TIL in Ancient Rome, besides famous gladiator fights there were so-called Naumachia ‒ naval battles taking place in huge artificial basins with seating tiers surrounding them, similar to amphitheatres.

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01e5 TIL That you don’t really need to brush twice a day AFTER meals. Brushing is really just about cleaning the plaque which houses microbes on your teeth. It’s better to clear the plaque before meals so that your meals don’t feed the plaque which feeds the teeth-damaging microbes.
rrvW TIL that VISA and MasterCard both started as not-for-profits and only turned in for-profits in 2006-2008
Mb10 TIL “Eating carrots will improve your vision” is actually based in wartime propaganda designed to explain why pilots were able to fly so well at night without revealing the new invention of radar technology to the enemy.
V09m TIL In the Vietnam War, the US military produced recordings of ghostly voices and eerie sounds to play to the Vietcong, who believed that if a body wasn’t buried, the person’s soul would wander the Earth forever
8awDX TIL that when Randy Pausch from the Last Lecture, who dreamed of "being Captain Kirk", was given a fatal diagnosis of pancreatic he received an autographed picture of Kirk from William Shatner that read "I don't believe in the no-win scenario"