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The Colossus computer, used to break codes during World War II, 1943. On Wikipedia.

Upcoming Web Maintenance Today

For the period of 90 to 120 minutes this afternoon, starting at 4:00 p.m. EST, our website will undergo maintenance, during which time you will not be able to access AHA web content. We apologize for any inconvenience, and we

February 18, 2015