Inside U.S. scientists' groundbreaking test to grow potatoes on Mars

NASA and private companies are all vying to send astronauts to Mars, but when they get there, they'll all face the same problem -- growing food.So U.S. scientists have headed to the deserts of South America to see if they can cook up a solution. Potatoes have played a starring role in one recent Hollywood film set on Mars, but it turns out growing potatoes on another planet may be far from science fiction, reports CBS News correspondent Mark Albert.A vast plain dotted with dunes, molded by centu