This hour: a purple hotel, a family who argues over their skin color, a singing rainbow and more. (more)

What is the most expensive thing in the world? (more)

But what is yellow? (more)

In which Dr. Robert W. Smith, University of Nebraska Chemistry professor, describes the enormity of distance between an organic molecule and the smallest living cell. (more)

What is the most expensive thing in the world? (more)

NASA is figuring out how to take the next great leap into space. The difficulty is, if we leap to Mars, we might not make it back. (more)

A Canadian filmmaker who lost his eye replaces his prosthetic with a bionic camera-eye so he can shoot documentary video from his pupil. (more)

I take one place, look at what or who lived there over a very very long period of time, and give you the edited highlights. (more)

This hour: how and why we're wired for sound. A look at music and the brain. (more)

Sometimes interviews take strange turns - especially when the interviewee is a nine-year-old boxer with an inventive imagination. (more)

This hour: a one way mission to mars, a Russian cosmonaut's favorite music, the Voyager golden record, the sound of the northern lights, and more. (more)

Do we live in a world where there is magic and meaning, or is it all just chance? (more)

What happens when you work with sound everyday -- listening to it, recording it, manipulating it -- and then one day, one of those sounds sticks around for good? (more)