Clemency, Diocletian and Maximian retire, the Kingdom of Great Britain, Wedgewood Pottery, the Penny Black postage stamp, the Crystal Palace Exhibition, J. Alan Hynek, Pluto, the Empire State Building, the Polio vaccine, SpongeBob SquarePants, and more, this day in history, May 1.
#history, #thisdayinhistory, #May1
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