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TIL that FDR was 39 years old when he contracted "infantile paralysis", the contemporary name for polio

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b9JAa TIL that the summit of Mt. Everest is made of marine limestone which means the highest point on earth was once at the bottom of the sea.
R54jQ TIL that when Hamlet talks about knowing “a hawk from a handsaw,” he wasn’t referring to the tool but a bird (handsaw was originally “heronshaw,” an old form of “heron.”)
wLEJ1 TIL Saturn's rings have an atmosphere of molecular oxygen (O2) which is independent from the planet's atmosphere.
PYPDG TIL that exercise does not actually contribute much to weight loss. Simply eating better has a significantly bigger impact, even without much exercise.
4XPkX TIL that a thermos works because there is a vacuum between the walls of the container, limiting the transfer of heat to or from its contents.