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Catherine Lord plays with wolf puppies for a living. She's fascinated by what separates wolves from dogs. They share 99.9% of their genetics, but they're very different animals. Catherine sent me some audio she recorded during her research.

Dogs were the first domesticated animal in history, emerging from wolves some 20,000 years ago. But how did wolves become dogs? To find the answer, scientists have to play with a lot of puppies.

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