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TIL the biological theory that males are naturally promiscuous and females naturally monogamous was largely based on one study of fruit flies from 1948

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9Y1QB TIL before MRI scans were widespread, doctors used an extremely painful X-ray to look at the brain where the CSF was drained and replaced with air. They would strap patients into a rotating chair to angle them upside down so that the fluid would be fully replaced in different parts of the brain.
4kKrR today i learned: green olives don’t have a bright red center, those are pimento’s stuffed in them. i am way to old to have just learned this…
R5kGw TIL there is still thousands of unexploded Japanese balloon bombs in the continental 48 states from WWII.
dDrJ7 TIL that it is not known exactly when the University of Oxford was founded
p8QQG TIL Starfish can drop off their arms when they feel threatened. Some species can even regenerate themselves from a single arm, as long as there's a small portion of the central disk, and some also reproduce that way, simply splitting in half to become two individual starfish.