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TIL that the phrase ''Pushing The Envelope'' is not about the container for letters- but is related to a mathematical graph of aerodynamic performance on which the envelope is the boundary line representing an aircraft's capabilities.

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R5Dxj TIL that Radio City Music Hall in New York was originally intended to showcase vaudeville-style acts, but the initial opening was a disaster with singers and dancers dwarfed by the cavernous 6,200 seat hall. It then primarily became a movie theater and venue for large scale concerts and stage shows.
mxAlv TIL The Netherlands has a comprehensive educational system for cyclists and drivers alike that begins in elementary school
0vRp TIL that a 1000MW coal power plant puts 100x more radiation into the atmosphere than a nuclear power plant
9YY1B And everyone else.
b6p7E TIL that the term "rooster" for a male chicken was introduced in the 18th century specifically as a euphemism to avoid the sexual connotation of the the original term "cock."