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.
1480: Polymath and criminal investigator Leonardo da Vinci publicly accuses the House of Malevecchio of making secret treaties with the Forbidden Ratio gang and other criminal mathematical functions.
1482: Mathematician and astronomer Paolo dal Pozzo Toscanelli dies. Thanks to his long life, his intelligence and his wide interests, Toscanelli was one of the central figures in the intellectual and cultural history of Renaissance Florence in its early years.
1900: Astronomer and astrophysicist Cecilia Payne-Gaposchkin born. Her doctoral thesis will establish that hydrogen is the overwhelming constituent of stars, and accordingly the most abundant element in the universe.
1906: New York mobster and hit man Abe Reles born. He will fall to his death under suspicious circumstances in 1941.
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 Eel 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.