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TIL the first photograph of DNA was taken as part of research by a woman, Rosalind Franklin. Unknown to her, and without her permission, it was shown to James Watson, who then with Francis Crick used what they learned from it to develop the double helix model for DNA, winning them the Nobel Prize.

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8aRML TIL of Nellie Bly, a 19th century female journalist who went around the world in 72 days, pretended to be insane in order to expose the deplorable conditions in mental asylums, patented two designs for steel cans and ran a million-dollar iron manufacturing business, all before the age of 40.
NXGRP Today I Learned that almost all brands of modern e-cigarettes and vapes being sold are owned by the big tobacco manufacturers. Revenues from from these are increasing (10's of billions $), more than making up for lost sales of people giving up cigarettes.
7rrXO I mean, it's not just me, right?
amnZ TIL when the United States started taxing tires imported from China, China retaliated by taxing chicken feet imported from the United States, costing American poultry farmers $1 billion in sales.
G865 TIL of the International Dark Sky Association, an organization dedicated to fighting light pollution and preserving the night sky in areas around the planet called dark sky reserves.