The North American Automated Missile Response System analyzes 1,542 sensors of all kinds. Final testing involved over a billion random simulations.

The combination of a power failure in DC, a fire in Chicago, an earthquake in Iowa, and a solar flare was one of the vigintillion conditions not tested.

Oops.

Harry Demarest has retired after careers encompassing scientific  research, teaching at a university, software development, web application development, and voter database compilation and  distribution. He is now spending his time with his grandchildren and writing memoirs and short stories.