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TIL, In 2009, the remains of an unknown Union soldier, believed to be between 17 and 19 years old, were discovered on the Antietam National Battlefield and identified as a New York volunteer, were found in the Cornfield, and were returned to New York for burial with full military honors.

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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.
4XaVb TIL Kaiser Wilhelm II drew up plans to invade the United States in 1897. The plan called for an attack on Boston and New York in order to neuter American power in the Pacific.
W7Oe9 TIL that Tyrannosaurus lived 66 million years ago. Stegosaurus lived 145 million years ago. We are closer in time to Tyrannosaurus than Tyrannosaurus is to Stegosaurus.
e0kBE TIL in 2000 an impoundment spill in Martin County, Kentucky emptied 300 million gallons of waste (volume of the Empire State Building) containing mercury and arsenic into rivers feeding the Ohio River. Massey Energy received a $5600 fine by federal regulators.
LQ5vV TIL that some New England towns had a tradition of electing a black representative, where slave owners would grant a day off for slaves to participate in the festivities. These officials often served as parodies of elected white leaders, but others acted as reputable liaisons in race relations.