The Sound Barrier #3: What does silence sound like?

The Sound Barrier #3: What does silence sound...

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The Hitchhiking Microbe’s Guide to the Galaxy

Can microbes travel through space on meteorites? It’s an idea called “lithopanspermia,” and to work out if it’s even feasible, some researchers decided to shoot microbes — with a gun. Guests: K.T. Ramesh, professor of science and engineering at Johns Hopkins University; Lily Zhao ...  Show more

Why did we go back to the moon?

For the first time in over 50 years, humans have gone to the moon and back. And this time, NASA says we're going to stay. NASA's planning for more missions, a permanent moon base, and even a mission to Mars. But there's a pretty big question hanging over all these dreams: Can hum ...  Show more

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