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TIL squirrels' brains grow in size during the fall to help them remember where they bury their nuts. Their brains are smaller the rest of the year

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16px7 TIL - in 1958, the US Air Force ran Project A119, to nuke the Moon with an H-Bomb
NWBe TIL that Benjamin Bradley in 1856 invented the first steam engine powerful enough to fuel a naval ship, but he was unable to patent his invention because he was a slave
Ly80 TIL: The common spiral depiction of the Milky Way Galaxy used in media is actually another galaxy:Messier 74. Because we dwell within the Milky Way Galaxy, it is impossible for us to take a picture of its spiral structure from the outside.
ADGVw [TIL] A 2013 Spanish study found that Helvetica, Courier, Arial and Verdana were the best fonts for dyslexics, as well as lightly colored paper, 12-14 point sans serif font, and bolding of text for highlighting.
OkZX TIL the earliest historical record of pillow use is from about 7000 BCE in the ancient civilization of Mesopotamia.