Template:Selected anniversaries/May 10
28 BC: A sunspot is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China.
1482: Mathematician and astronomer Paolo dal Pozzo Toscanelli dies.
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1906: New York mobster and hit man Abe Reles born.
1958: Chrome Plover, the famed musical electroplating ensemble, perform new work in tribute to "Hello World" programs.
1960: Mathematician, art critic, and alleged time-traveller The Ell stops aquatic cryptid Neptune Slaughter from sabotaging Operation Sandblast.
1960: The nuclear submarine USS Triton completes Operation Sandblast, the first underwater circumnavigation of the earth.
2018: Green Tangle 4 declared Picture of the Day by the citizens of New Minneapolis, Canada.