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TIL that we humans have no sensors to detect low levels of oxygen unlike in movies where people gasp in oxygen depleted environments. Three seafarer were in killed in a chain locker room in a ship and the oxygen was depleted because of rust.

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grg17 TIL While nicknames in English are mostly derived from the beginning of a name (Benjamin to Ben, William to Will), nicknames in Spanish are normally derived from the end (Benjamín to Mín, Ramón to Món, Enedina to Dina).
npjG TIL that the French lost more men in battle during the American Revolution than the Americans did.
R76Ja TIL about the Anti-Rent War, a tenets revolt in upstate New York where renters declared their independence from the manor system run by patroons, resisting tax collectors and successfully demanding land reform.
loDGK TIL that "salting the earth" was a way to totally screw a vanquished enemy by poisoning their land so nothing would grow there. Obvious question: how did they get that much salt?
VVxk TIL horses have the largest eyes of any land mammal, have excellent day and night vision, but they have two-color, or dichromatic vision; their color vision is somewhat like red-green color blindness in humans, where certain colors, especially red and related colors, appear as a shade of green.