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Coming up, how a slug-like fossil is shedding light on the mollusk family tree.

So it sort of ends this paleontological mystery.

And the Arctic is melting.

But is that the end of the story, Fayette's ice?

If we were able to reduce the temperatures, then the ice would come back.

Plus how free-floating DNA could impact how cancers evolve.

This is the Nature podcast for February 9th, 2017.

I'm Kerry Smith.

And I'm Adam Levy.

The Arctic is losing its sea ice and fast.

The ice has thinned and retreated,

leaving behind just a quarter of what was there only 30 years ago.

Adam takes a look at why that matters

and whether one day we might be able to grow it back.

Researcher Dirk Notts has a very personal relationship

with the ice at the top of the world.

I think as a kid I was just fascinated by anything adventurous.

...