Podcast: A Moonless Earth, Gulliver's Conundrum, and a Good Time to Kill

David is the Online News Editor of Science.

Does Earth really need its moon? How do we use our bodies as a size reference for the rest of the world? And when is it ok to kill? Science's Online News Editor David Grimm chats about these stories and more with Science Podcast host Robert Frederick.

(Listen to the full Science podcast and more podcasts.)

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