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TIL: A teen in Michigan built a working nuclear reactor. He taught himself how to build it as a weekend hobby project in his basement from ages 15-17 for $3500.

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97vp TIL There exists a giant cloud of alcohol in outer space which can be used to produce 400 trillion trillion pints of beer.
KPkQ TIL Thomas Howard, 3rd Duke of Norfolk, survived his execution day because the King who wanted him executed died that day
kJ4nm TIL in 1912 4 yr-old Bobby Dunbar disappeared, was found eight months later in Mississippi with a couple that refuted that it was him. Courts ordered the boy to live with the Dunbars. 100 years later DNA verified that the boy was Bruce Anderson and had been wrongly identified by Dunbar's parents
m1pOo TIL, starting in 2019, Box Tops are not physically collected anymore.
neMWo TIL To pull yourself up by your bootstraps is actually physically impossible. In fact, the original meaning of the phrase was more along the lines of “to try to do something completely absurd.”