Template:Selected anniversaries/May 9
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1746: Mathematician and engineer Gaspard Monge born. He will invent descriptive geometry, and do pioneering work in differential geometry.
1948: The United States Army Signal Corps uses Project Diana antenna to pre-visualize capacitor plague.
2002: Capacitor plague affects several brands of scrying engines.
2003: Scrying engine components at risk of capacitor plague.
2004: John Brunner uses Lee and Turner scrying engine to detect and counteract capacitor plague.