This week, ancient teeth found in China forced scientists to rethink migration.

Maybe there is not only one out of Africa, there are several out of Africa.

And neuroscientists thought they knew everything about the nematode worm.

It's the only organism that has a fully described connectivity map of the nervous system.

But it turns out the map needs an update.

Plus, what the Paris climate talks can learn from the science of cooperation.

This is the nature podcast for October the 15th, 2015.

I'm Adam Levy.

Few animals have been more intensely studied than the worm,

Kennerobditis elegans, or sea elegance to its friends.

It was the first animal to have its genome completely sequenced,

and every single one of its nerve cells has been mapped.

Well, almost everyone. Scientists have discovered two new neurons lurking in the head of the male worm.

Appropriately, the team named them mystery cells of the male.

Then they took all the mystery out of them by finding out exactly what they do and where they come from.

I went down to a lab at University College London to meet two of the team who found the mystery cells, neuroscientists Richard Poole and Orancher Barrios. Richard first.

Can I update his elegans is a nematode worm that was first used for neuroscience in the 60s.

It was Sidney Brenner who decided to work on the worm.

And he chose to work on them because they have a complicated enough nervous system to have really interesting behaviours,

but a simple enough nervous system to be able to understand it in depth.

We know a lot about its neuronal circuitry as well, don't we, more than any other animal potentially.

That's right.

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