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When Grant Coursey was a toddler, he was diagnosed with neuroblastoma, a cancer often found in young children. A tumor had wrapped itself around his spinal cord and was pushing against his lungs. It took three surgeries, but Grant is cancer-free.

The Cold War is over, but decades later, several defunct missile silos built to fight that war still dot the American landscape. A developer in Kansas is converting one such silo complex into an underground condo tower.

With gasoline prices on the rise and pressure mounting to make better use of domestic energy, natural gas vehicles are making a comeback. Climate change is also driving demand — natural gas produces 20 to 30 percent fewer carbon emissions than diesel.

A dentist from Alberta, Canada, paid $10,000 for a crown that once belonged to The King: Elvis Presley. That isn't the only dental collectible this dentist has paid top dollar for. He shelled out $31,000 for a rotten tooth that belonged to John Lennon.

David Greene talks to materials chemist Donald Sadoway from the TED (Technology, Entertainment and Design) conference in Long Beach, Calif. Sadoway is the co-inventor of the liquid metal battery. It's inexpensive, super efficient, sustainable and can provide large scale energy storage.

Students at London's Kingston University this week unveiled luxury designs made of bio-degradable materials. There are stilettos made from pistachio shells and coffee beans, a wood-chip corset and a top made from orange peel.

"I only wish I could have done more," Frank Hall said. I'm not a hero. Just a football coach and a study hall teacher." Three students were killed and two others were wounded. The suspect was a fellow student.

After weeks of shelling and sniper fire from Syrian Army forces, the people who remain in the Baba Amr district of the city of Homs may finally get some aid from the outside world today.

South Sudan gained independence in 2011, but it has been locked in a bitter conflict with its northern neighbor. Rep. Frank Wolf (R.-Va.) just returned from the area. He talks with host Michel Martin about what some observers are calling a humanitarian crisis, and what the U.S. can do to help.

Rick Santorum and Mitt Romney appeared locked in a tie for Ohio's Republicans, with the former senator's lead in Ohio shrinking from what it was before the recent Michigan primary which Romney won.