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This week we dive into the unexplored world of ocean viruses.

We learned in this study, for example, that less than 1% of these viruses did we even know anything about.

And economists don't have a perfect measure of social class. Here's why they need one.

I think it would allow us to forecast what's going on in the world more effectively.

I think it would allow us to understand the challenges we face socially.

Plus, a collection of studies traces the journey of humans out of Africa.

This is the Nature Podcast for September the 22nd, 2016.

I'm Kerry Smith.

And I'm Adam Levy.

First up this week, immerse yourself, as we have,

in Noah Baker's infectious enthusiasm for oceans.

Imagine you're at a beach, having a nice, relaxing swim.

Then suddenly, a big wave crashes over you and you swallow a mouthful of seawater.

First thought, gross, tastes foul.

But there's a lot more in that mouthful than you might think.

There's about 50 million viruses per mouthful of seawater.

That's Matt Sullivan from Ohio State University.

Luckily for you, that viral mouthful isn't going to land you in a doctor's office.

These viruses would be pretty specific for marine microbes.

Even though the oceans play host to a gigantic number of viruses,

...