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TIL Painite, the rarest gem in the world, only has two dozen specimens ever found.

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VBm5k TIL About firedamp whistles, a device designed to detect flammable gases in a coal mine by blowing local air and a reference gas through whistles and listening for a "beat" caused by a slight difference in the frequency
kO0xg TIL Goodhart's Law, the principle that when a measure becomes a target, it ceases to be a good measure. For example, when a government tries to bring down unemployment figures to demonstrate how well the economy is doing, unemployment figures stop being a good measure of the economy.
e0lEn TIL that in the US from 1951 to 1963, the rate of tax for the highest earners was 91-92%.
16OMO TIL Kaluga (Huso dauricus), also known as the river beluga, is a large predatory sturgeon found in the Amur River basin. With a maximum size of at least 1,000 kg (2,205 lb) and 5.6 m (18.6 ft), the kaluga is one of the biggest of the sturgeon family.
D1e9P TIL Australian speed skater Steven Bradbury won a gold medal in the 2002 winter olympics as his entire competition crashed out in the finals