Mars: Our next home planet?

Would you like retire to Mars? It may be possible in the not-so-distant future. Mars is more Earth-like than any other planet in our solar system. In fact, billions of years ago it was warmer and wetter and life may have developed there. Scientists are trying to figure out why it changed and if we could change it back so humans could live there. In this episode you'll learn about Mars' ancient past, you'll meet an architect hoping to build cities there and you'll hear from Mars itself, thanks to the planet's video blog, of course. Plus: In our Moment of Um we answer this question: "Why is money valuable? It's just paper."

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