On July 26, 2004, a 5-year-old startup by the name of Google was faced with a serious problem: their application was down.
For several hours, users across the United States, France, and Great Britain were unable to access the popular search engine. The then-800-person company and its millions of users were left in the dark as engineers struggled to fix the problem and discover the root cause of the issue. By midday, a tedious and intensive process conducted by a few panicked engineers determined that the MyDoom virus was to blame.