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TIL in the original 1938 comics, Superman could not fly, but he could leap tall buildings in a single bound. Superman gained the ability to fly in the second episode of the radio serial in 1940

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KYwb4 TIL that Santorio Santorio, an Italian Professor, Physician, qnd Physiologist weighed everything he consumed and excreted over a period of 30yrs in the study of Insensible Perspiration or what we know today as metabolism.
4kXNX TIL hiccups are an evolutionary remnant of amphibian respiration and came before lung respiration. This is supported by the fact that amphibians take in water and air through their gills through a similar mechanism to how we hiccup.
6EJwY TIL that the first non-stop UK to Canada flights were RAF Canberras carrying BBC recordings of Queen Elizabeth II's coronation, so that Canadians were able to watch it the same day it happened.
rR6jo TIL The Soviet Union did not admit that a reactor had exploded at Chernobyl until nearly three days after radiation from the disaster set off alarms at a nuclear plant in Sweden 1000 km away
BgJEr TIL the inventor of Scotch Tape named it that after he was told he was being too "Scotch" with the adhesive. This was a pejorative in use at the time meaning "stingy".