When the final round of the Urban Challenge begins Saturday morning, that field will have been whittled down to just 20 or so robots by the event's sponsor, the Defense Advanced Research Projects Agency (DARPA).

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Perhaps because the queues for food begin early every morning outside his church and are as much part of the urban landscape as the skyscrapers, he remains a little sceptical.

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And this morning we'll be asking what we can learn about big urban schools across the country from the troubles at Thomas Jefferson High.

NPR: Racial Tensions Overheat at L.A. High School

As of this morning, FEMA has more than 400 personnel already on the ground supporting the response, including three national Urban Search and Rescue Teams, an Incident Management Assistance Team, as well as personnel focused on helping survivors register for and receive the federal assistance made available by the major disaster declaration signed by the President on Monday night.

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