Computer viruses create more damage than just wasting time and resources. Every so often, we see the real-world impact of viruses, as on Thursday, when a virus shut down Customs Dept. computers, creating flight delays and long lines. As many as 5000 people were stuck in line in Miami, waiting for clearance. The computer glitch impacted airports in New York, San Francisco, Miami, Los Angeles, Houston, Dallas and Laredo, Texas, according to an Associated Press report.

The virus affected Customs databases but other than that Homeland Security officials declined to give any details about the attack.

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