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TIL The Sergeant at Arms of the United States House of Representatives can present a mace in a congressperson's face when a Member becomes unruly, thereby restoring order.

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XE6DR TIL of Rebecca Lee Crumpler, who in 1864 became the first African-American woman to become a physician in the United States. After the American Civil War ended in 1864 she moved from Boston to Virginia to provide medical care to freed slaves.
M7en8 TIL that on the atoll of Pinglelap, 10% of the population is affected by total colorblindness, with another 30% being unaffected carriers of the gene. This is due to a population bottleneck caused by a typhoon in 1775 that left 20 survivors on the atoll. One carried the colorblindness gene.
6NNQ TIL That Dreamcast games are still being made
GAYyG TIL NASA estimates that Voyager 1 will have enough power to continue communicating until 2025, 48 years after its launch. Its fuel for running the communications equipment, plutonium-238 dioxide, will have decayed too much to generate the required heat to keep them operating.
dJV9 TIL Otis Redding’s “(Sittin’ On) The Dock of the Bay” was recorded just two days before Redding died in a plane crash. The iconic whistling at the end of the track was the result of Redding forgetting the lyrics he had written for that part.