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TIL about La France (airship), the world's first fully controlled flight. In 1884 the electric powered, hydrogen filled airship traveled an 8km round trip, successfully returning to it's starting point.

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OGgoa TIL Clowns have a special way of "copyrighting" their particular facepaint by painting their likeness on eggshells.
R54o1 TIL for American food labeling, 1 fl oz=30 ml EXACTLY, and the related units cup=240ml, teaspoon=5ml, tablespoon=15ml, are also perfectly round numbers in metric. "Weight" ounces, though, are exactly 28g.
WkAjA TIL in 1872 a Japanese samurai and politician Shinpei Eto established a wanted photograph distribution system. Its first subject was Shipei Eto himself. The circulation of wanted photographs aided his swift arrest. He was executed at the age of 41
197W TIL an obscure mathematical principle called Zipf’s law has predicted the size of mega-cities all over the world. And nobody knows why.
xQdk TIL: The most recycled material in the US is asphalt. “99% of all asphalt is recycled & used to fix/build roads…US taxpayers saved $2.2B in 2011 by using recycled materials to pave roads. 66.7M tons of reclaimed asphalt pavement & 1.2M tons of reclaimed asphalt shingles went into paving projects.”