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TIL that the opposite of having extra fingers/toes - called polydactyly - is called oligodactyly, from the Greek "oligos-"=few.

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awGjL TIL: Sweat has less electrolytes than the blood, so by sweating you are increasing the concentration of electrolytes in the blood
EPKX TIL Lockheed Martin is developing an exoskeleton for the military that will allow a soldier to carry a 200lb load for extended periods.
gMPE8 TIL in 1857, a congressman from New York killed the U.S. Attorney for the District of Columbia over the attorney’s affair with his wife. He claimed temporary insanity (thanks to his wife’s infidelity), the first time this defense was used in U.S. history. He was acquitted.
4kmBN TIL that Baby Face Nelson killed more FBI agents than any other criminal in history.
Ybor TIL that William Henry Jackson’s photos played an important role in convincing Congress in 1872 to establish Yellowstone National Park, the first national park of the U.S. He was in a position to capture the first photographs of legendary landmarks of the West.