Apple CEO Timothy Cook made a rare appearance on Capitol Hill on Tuesday, testifying after congressional investigators revealed that Apple avoided billions in taxes. The New York Times' Charles Duhigg and guest host Jennifer Ludden talk about the tax code and the digital economy.

Monday's tornado tore through parts of Oklahoma City at 200 miles per hour and killed at least 24 people. Many more are missing orinjured. Guest host Jennifer Ludden talks to KOSU reporter Michael Cross and to meteorologist Paul Douglas about why it's so hard to track tornadoes.

The National Transportation Safety Board has recommended reducing the legal limit for blood alcohol content for drivers from .08 to .05. Critics say it won't significantly help prevent drunken driving. Guest LZ Granderson argues that without more checkpoints, a lower threshold would do nothing.

Graduation season is upon us and that means a slew of uplifting commencement speeches trying to motivate young adults to greatness. Science and experience tell us that everyone is motivated differently, so how do speakers, coaches and business managers inspire people?

As the populations in big cities increase and more people choose to live alone, a new trend of living in very small spaces has emerged. But the tiny living movement is not without controversy as growth of these multi-unit buildings puts pressure on established neighborhoods.