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TIL the Fat Man atomic bomb dropped on Nagasaki almost exploded in flight before being dropped

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8eEVX TIL of phantom islands, an island which was included on maps for a period of time, but was later found not to exist. Commonly the result of navigational errors, mistaken observations, or deliberate fabrication, some have remained on maps for centuries before being "un-discovered".
8elDb TIL: Excel spreadsheet can handle 1,048,576 rows and 16,384 columns at a time.
pMdZ TIL ancient Egyptian workmen who dug the pharaohs’ tombs got paid sick leave, according to 3000 year-old records
rRVZd TIL Crispbread has been baked in central Sweden since 500 AD. It was made as round wafers with a hole in the middle so the bread could be stored on sticks under the roof.
Ojy6 TIL that before the 1900s, women didn’t start having periods until much later in their adolescence, as in late teens or even their 20s