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TIL in 1913 a man was charged for threatening to kill his wife and newborn son with a knife. The mother remarried and the boy changed his name to that of his step-father. That boy went on to become the 38th President of the United States, Gerald Ford.

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VBnJD TIL that pyrite, called "fool's gold," really can be found with or mixed together with real gold.
GKV1 TIL that the Dance Fever of 1518 was a month-long plague of inexplicable dancing in Strasbourg, in which hundreds of people danced for about a month for no apparent reason. Several of them danced themselves to death.
OoGOX The sky appears blue for a combination of two reasons. Before white light reaches the Earth's surface, the light waves collide with and bounce off of the nitrogen and oxygen atoms in the atmosphere. Different frequencies of light (in other words different colours) are scattered differently. Higher frequencies (blue and purple) are more easily scattered and thus bounce around in all different directions more than lower frequencies (red or orange) do. The scattering of high frequencies alone would cause the sky to appear blue and purple, but our eyes work better at frequencies near the middle of the spectrum (yellow and green). Since the colour blue is closer to yellow or green than purple is, the sky we see appears blue.
BERW TIL a key ingredient in root beer (sassafras root) was found to be carcinogenic and banned in 1960 by the FDA. Artificial versions are now generally used instead
KOJ99 TIL that Milla Jovovich sang on the Underworld (2003) soundtrack and has released multiple songs.