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TIL That smiling in public is frowned upon in Russian culture. Excessive smiling is seen as a sign of dishonesty, insincerity, or even stupidity. Russians also tend to not smile in photographs for this reason.

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wvo8 TIL the dots that you see floating around while looking at the sky are your white blood cells.
78oPO TIL only one submarine has even been sunk by another while both were submerged
E1v4o TIL More than 2,500 left-handed people are killed every year from using equipment meant for right-handed people. That’s Crazy!!
awPWb TIL that more countries drive on the right side of the road than the left.
86j8 TIL that during the 1918 flu pandemic, 62 Boston prisoners volunteered to be injected with infected tissue and sprayed with infectious aerosols with a promise of release if they survived. All of the prisoners lived, but the ward doctor died soon after.