When a disaster hits, preparation is key. It used to be said that you should have three days' worth of food, water, and other basic supplies. Now it's said to be seven days' worth.

Martin Griss, the director of Carnegie Mellon Silicon Valley and the Disaster Management Initiative, recently spoke at NASA's Disaster Resiliency Panel held at Moffett Field in Mountain View, Calif. In the video, he explains how to build technologies that will make a difference for individuals and their communities when disaster strikes.

This video originally appeared on SmartPlanet with the headline "Disaster recovery: Where city and community plans are falling short."

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