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Welcome to the Science Podcast for May 22, 2015.

I'm Suzanne Bard, filling in for Sarah Crespi.

In this week's show, we have David Grimm up first with some online news stories, and then we hear from Katrina Carcaassus about the controversial use of testosterone testing

to determine women's eligibility to compete in elite sport.

Support for the science podcast is provided by AAAAS, the American Association for the Advancement of Science,

advancing science, engineering, and innovation throughout the world for the

benefit of all people.

AAAS, the Science Society.

Now we have David Grimm, editor for our daily news site.

He's here to talk about some recent online stories.

I'm Suzanne Bard.

In our first story, melting permafrost in the Siberian Arctic

has revealed new clues about the origin of dogs. Researchers collecting ice age animal bones in the region

thought they had a reindeer rib, but when they brought it back to the lab, it turned out to be

something else entirely. What was it, Dave? Well, it turned out to be the bone, and they're not sure what kind of bone, maybe a rib bone,

...