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TIL in Ancient Rome some condemned prisoners were executed onstage at the theater as "actors" for famous death scenes

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ExVX TIL that all cats with 3 or more colors are females
OkvR TIL horseshoe crabs’ blood does not contain hemoglobin. Instead, it contains hemocyanin, giving it a blue color. It also contains immune cells called amebocytes, which are used in medicine to detect bacterial endotoxins.
l77r7 TIL Plastic injection molding was invented in the 1800s to manufacture billiard balls out of celluloid, chiefly to replace ivory and save the lives of African elephants
5Y9l8 TIL that in a double-blind study, involving both new and Stradivari, expert violinists preferred new violins, voted the Strads the worst sounding and could not tell if their preferred violin was new or antique
pjKO TIL there are no bridges over the Amazon River