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TIL of a cat that served on the Royal Navy sloop HMS Amethyst. The cat received the PDSA's Dicking Medal after surviving injuries from a cannon shell, raising morale, and killing off a rat infestation.

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BvoW TIL of the peanut butter tree. A tropical tree that smells like peanut butter and produces fruit that tastes like it as well.
jQ4v TIL it is not coldest just before the dawn - it is coldest about an hour after dawn. The temperature only begins to increase once the incoming solar radiation overcomes the heat radiating away from earth.
b91pZ TIL There is a 2 foot wide panel studded with 100 mirrors on the moon, which astronomers can use to measure the distance between earth and the moon extremely accurately.
JPov TIL that Iron Man is either powered by Open Source software or made of Lego. (according to this eagle eyed programmer)
kOJVm TIL Africville was a black community in Halifax dating from 1840s but razed in the mid-1960s and its 400 residents were relocated as part of a redevelopment plan. Moving Africvillers into the city was seen by the government as a way to integrate them and meet their needs