At exactly two minutes after midnight on Jan. 1, 2000, an alarm sounded at a nuclear power plant in Onagawa, Japan. Government officials and computer scientists around the globe held their breath. Was this the beginning of a massive Y2K computer meltdown? Actually, no. It was an isolated event, one of a handful of glitches to occur (including the failure of 500 slot machines at two racetracks in Delaware) as the sun rose on the new decade. The dreaded millennial meltdown never happened.