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Two biochemists were honored with the Nobel prize for chemistry in recognition of their discoveries of the tiny channels that let vital substances move through cell walls. Margaret Warner talks to Peter Agre, one of the prize recipients.

Western regions of the United States continue to cope with the decimation caused by the lack of rain. Ted Robbins of KUAT in Tucson, Ariz., provides an update on the drought.

Early this morning, Mars had its closest encounter with Earth in 60,000 years, giving observers the best view of the red planet in their lifetimes. Terence Smith discusses the event with astrophysicist Neil DeGrasse Tyson.

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