This is WEEKEND EDITION from NPR News. I'm Rachel Martin.
For more than 40 years, American presidents have talked about the need for the U.S. to become energy-independent. Easy to talk about, difficult to make happen. But some recent discoveries could mean a giant leap in that direction. We begin this hour talking about energy and whether it's the kind that burns to power the internal combustion engine in your car, or the kind that harnesses wind to turn on the lights in your house.