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If life exists on Mars it could pose a serious problem for our exploration of the planet

NASA announced last month that they found flowing water on Mars. The discovery is our best evidence yet that the planet supports life. But as science journalist Carl Zimmer explains, life on Mars could be a problem for our exploration of the planet.

Zimmer is a columnist for the New York Times, and the author of “Planet of Viruses.”

Produced by Alex Kuzoian and Jessica Orwig

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