Template:Selected anniversaries/September 18
1751: Mathematician, astronomer, and crime-fighter Pieter van Musschenbroek uses a grid of Leyden jars to detect and prevent crimes against mathematical constants.
1783: Mathematician and physicist Leonhard Euler dies. He made important and influential discoveries in many branches of mathematics, and introduced much of the modern mathematical terminology and notation, such as the notion of a mathematical function.
1913: Jazz drummer and theoretical physicist Albert Einstein performs at charity concert to benefit victims of crimes against mathematical constants.
1967: Physicist, academic, and Nobel Prize laureate John Cockcroft dies. He was instrumental in the development of nuclear power.
1976: The Custodian tells a funny story about why you can't go in there.
1977: Voyager 1 takes first photograph of the Earth and the Moon together.
1978: Electrical engineer and crime-fighter Florence Violet McKenzie publishes memoirs, reveals that she received messages from AESOP during the Second World War.