Terry Gross

Would you eat a steak grown in a laboratory? Science writer Michael Specter examines the progress scientists have made in developing test-tube meat. "Depending on what your definition of any sort of life is, this is as fundamental as any animal is," he says.

The world's rapidly expanding population has created elevated demand for food, but changes in climate and irrigation have made it increasingly difficult to boost production accordingly. Environmentalist Lester Brown explains why he believes "food is the new oil" and may lead to political upheaval.

Area 51 is classified to the point that its very existence is denied by the U.S. government. Journalist Annie Jacobsen says it's not because of aliens or spaceships -- but because the government used the site for nuclear testing and weapons development.