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TIL about the ‘Doppler effect’ which explains why a siren's pitch changes as it passes by

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9wV07 TIL about the 'Sacamantecas' (Spanish for "Fat Extractor"), a bogeyman in Spanish folklore similar to the sack man, based on Manuel Blanco, Spain's first documented serial killer who abducted people to extract their body fat and make soap.
QNMGe TIL that Texas is larger than any country in Europe. Not only that, if it were its own country, it would be 40th out of 193 in size.
gMOnW TIL the Navajo Nation reservation is so large (71,000 km2), its area exceeds at least 10 US states in size.
VBw6Z TIL it used to be illegal for women to wear trousers in the USA
0wN4p TIL Canada has a strategic maple syrup reserve to ensure global supply in case of emergency.