› added 3 weeks ago

10

TIL You shouldn’t rinse your mouth immediately after bushing your teeth. Fluoride strengthens tooth enamel, leaving it on the teeth for at least 15 minutes after brushing can help make the enamel more resistant to cavity-inducing acids.

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a8Bmb TIL Gustav III of Sweden got a letter saying he was about to be killed at the masked ball he was attending later. He dared the would-be assassins by standing in an open box at the opera house for 10 minutes. Since he didn't get shot there, he deemed it was safe to join the crowd...where he got shot
X0PQQ TIL that since 2020, a group of fifteen orcas have been ramming and biting boats in the Strait of Gibraltar, with four boats having been sunk and over 250 damaged.
LknLp TIL that blood being blue until coming in contact with oxygen is a myth. Veins appear blue through our skin because red wavelengths are absorbed by our skin more than blue wavelengths resulting in the appearance of blue veins.
QJMoE TIL that in 1975 a cat was credited as a co-author of a physics paper, after Jack Hetherington accidentally used articles such as "we" and "our" in a study on atomic behavior. Unwilling to change the errors, he simply added his cat as a co-author, under the name "F.D.C. Willard"
Z8wvQ TIL A Turkish mother took care of a paralyzed Russian boy she didn't know for ten years until he died in 2018.