Exploring the biggest questions of our time with the help of the world's greatest thinkers. Host Manoush Zomorodi inspires us to learn more about the world, our communities, and most importantly, ...

Back to our radio signal. The electrons in our wire are moving, but not in one direction. These electrons are moving back and forth. Actually, the wave displayed in the activity is a representation of ...

NPR's weekly news quiz hosted by Peter Sagal. Have a laugh and test your knowledge with today's funniest comedians and a celebrity guest.