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TIL that the HEPA filter was conceived during WWII to guard soldiers and scientists, especially those working on the Manhattan Project, from radioactive particles.

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WlWo TIL that in a study of placebos, 30% of patients who received the placebos instead of chemotherapy experienced hair loss
4X8ma TIL that on October 30, 1950, the US government bombed Puerto Rico to suppress nationalist feelings to become independent
erJL TIL 53% of Indian children are sexually abused
4XBeJ TIL: That "the fist of the sender," the personality of a morse code operator in WW2, could identify allies from enemies, their locations & troop movements, and more. The pace and style of their communication allowed expert operators to track them. This was the precursor to modern keystroke dynamics.
yVLmX TIL that US President Chester A. Arthur was accused of not being a natural-born citizen because his family moved around a lot when he was growing up.