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TIL The tiles on the space shuttle dissipate heat so efficiently that you can pick them up straight out of a 2200 degree oven.

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ADmNx TIL the fultograph was able to broadcast pictures to homes via radio in the 1920s. Using the output from the loud speaker socket it darkened an area of sensitized paper on a rotating drum.
oBwJr TIL that by mass, polonium-210 is nearly 250,000 times more toxic than hydrogen cyanide
OgVe TIL that the saying ‘to take with a grain of salt" comes from Pliny the Elder, who wrote about an antidote for a certain poison, having as one of its ingredients a measure of salt. He thought that if an antidote involved salt, then the poison itself should be regarded less seriously than normal.
e0lXJ TIL that the red liquid seeping out of a cooked rare steak isn’t blood. It is in fact a mixture of a protein called ‘Myoglobin’ and water. Myoglobin helps muscle tissue store oxygen and just like Hemoglobin, contains iron that turns red when it binds with oxygen.
nZMr TIL Australia’s first police force was comprised of the best-behaved convicts