Template:Selected anniversaries/July 18
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1562: Mathematician and fencer Ludolph van Ceulen demonstrates new class of Gnomon algorithm functions which detect and prevent crimes against mathematical constants.
1853: Physicist and academic Hendrik Lorentz born. He will share the 1902 Nobel Prize in Physics with Pieter Zeeman for the discovery and theoretical explanation of the Zeeman effect.
1997: Geologist and astronomer Eugene Merle Shoemaker dies. Shoemaker was the first scientist to conclude that Barringer Meteor Crater in Arizona, and similar craters, were caused by meteor impact.