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476

Or, why everyone is stocking up on iodine tablets

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1aLOV TIL a sundown town is a community that for decades kept non-whites from living in it and was thus “all-white” on purpose.
Bgxve TIL of Miyake events, rare bursts of cosmic radiation that create spikes in C14 detectable in tree rings.
WkrlY TIL that bees can recognise human faces!!
KOmGJ TIL the period 1955-1972, the development of nuclear rocket engines in the USA began with the "Rover" project. The first experimental nuclear engine was named "KIWI" and experiments were performed on it until 1964. They constructed a compact nuclear reactor with U235 carbide in a graphite housing.
wglW TIL in 1918, the geographic center of the United States was determined by balancing a cardboard cutout shape of the US on a point. It was accurate to within 20 miles.