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TIL blood pressure has a daily pattern with its highest point usually in the afternoon and the lowest point at night.

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xV4Ak TIL Apparently Easter Island's Heads Have Bodies
djEQ TIL During WWII, George de Hevesy used aqua regia to dissolve the Nobel Prizes of German physicists Max von Laue and James Franck to prevent them being confiscated. He left the solution in his lab, where it was ignored. After the war, he precipitated the gold out and the medals were recast.
MrM7 TIL the easiest way to lower the cost of healthcare is to get rid of insurance companies.
d8A98 TIL the camera film for the famous "Tank man of Tiananmen square" photo was hidden in a toilet while Chinese police searched the photographer's hotel room
jN8QR TIL the term "Native American" is falling out of favor amongst indigenous Americans, in favor of indigenous Americans, American Indian, or the name of their own tribe.