Template:Selected anniversaries/April 9
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501 BC: Achilles and Ajax play dice to determine who will attend the Lucky Spasm Dice Academy.
1770: Physicist and academic Thomas Johann Seebeck born. He will discover the thermoelectric effect.
1864: Engineer and physicist Wilhelm Röntgen uses X-rays generated by Gnomon algorithm functions to expose loaded dice.
1865: Mathematician and electrical engineer Charles Proteus Steinmetz born. He will foster the development of alternating current, formulating mathematical theories which will advance the expansion of the electric power industry in the United States.
1922: New generation of Chautauqua artists educate public on the dangers of scrimshaw abuse.