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TIL that in 1987, FBI agent Robert Hanssen was tasked by his superiors to find a mole within the agency after the FBI’s moles in the KGB were caught. In reality, he was the mole, working with the KGB since 1979.

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R5n56 TIL George Jennings invented the public toilet. It premiered at the Great Exhibition in 1851 and cost one penny to use the toilet. Since then, "To spend a penny" became a euphemism for going to the toilet in the United Kingdom
G8DG TIL 19th century Czech anatomist-physiologist, Jan Purkyně (Johann Purkinje), was so famous that when people from outside Europe wrote letters to him, all they had to put as the address was “Purkyně, Europe”.
gxA4 TIL Methane Hydrate, a new and completely untapped reservoir of fossil fuel exists in huge amounts in the deep sea. Is estimated that there could be more potential fossil fuel contained in the methane hydrates than in all classic coal, oil and natural gas reserves combined.
woGEW TIL that lots of paintings on wood were transferred to canvas from the 18th century onwards to ‘prevent’ deterioration. Some transfers were more successful than others.
b6Jr0 TIL about Freeports. Tax Free storage units the wealthy use to store Art, wine, and artifacts investments. The Geneva freeport holds more art then the MOMA in pieces and value.