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Welcome to the science podcast for July 17, 2015.

I'm Sarah Crespi.

In this week's show, John Bohannon talks about artificial intelligence in the psychologist chair,

and David Grimm is here with some of our latest online news stories.

Support for the Science Podcast is provided by AAAS, the American Association for the Advancement of Science.

AAAS, the Science Society, at www.aAAS.org.

Now we have David Grimm, editor for our daily news site. He's here to talk about some recent online stories.

I'm Sarah Crespi. First up, we have a story on how old our hands are. We humans diverged from chimpanzees about seven million years ago.

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