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TIL that Aphantasia is a neurological phenomenon where individuals can't create voluntary mental images, including visual, auditory, or sensory representations in the mind's eye.

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r86y TIL 50 years before women were allowed to enroll into medical school, Margaret Ann Bulkley dressed as a man for 56 years to study medicine and become her alter-ego, Dr James Barry. It was only when she died in 1865 that her secret was exposed after 46 years working as an army medical officer.
Wk5wA TIL the massive cannons used by the Ottomans to besiege and capture Constantinople in 1453 were again bought out for a bombardment against the Royal Navy, almost 400 years later, in 1807
78pvr TIL that a typical fire extinguisher only lasts seconds while continuously being sprayed. A 20 pound extinguisher can only be sprayed for 25 seconds.
rNP0 TIL the distance between Europe and Africa is only 36 miles and there are talks of creating the longest bridge ever
eKxn TIL Stairwells in medieval castles curved very narrowly and clockwise. Attackers coming up the stairs had sword hands (right hand) against the interior curve of the wall and made it very difficult to swing their swords. Defenders had their sword hands on the outside wall giving much room to swing.