Ah, Benny's parents, thanks for coming.

Hiya.

So, Benny has really blossomed this term.

You're telling me, he outgrew his bike. We sold it, on eBay.

Oh, that's not quite what I meant.

It's free to sell on there.

Free to sell?

Easy too. Sold Benny's bike, your guitar, my jacket.

You sold my guitar?

Shall we talk about Benny?

When it's this easy to sell for free, you can't help but say when it's eBay.

Things people love.

T's and Cs apply, exclusive vehicles.

Welcome to Science Talk, the weekly podcast of Scientific American.

For the seven days starting January 10th. I'm Steve

Mercky. This week on the podcast, high schooler Dimitri Van Trub talks about his mathematical

project that recently won the annual Siemens competition in math science and technology,

and that comes with a hundred thousand dollar scholarship. We'll test your knowledge about

some recent science in the news.

And first up, author and journalist Carl Zimmer.

He wrote the article, Evolved for Cancer, in the January issue of Scientific American.

To find out more about why cancer may be an unavoidable part of being human, I called Carl at his home in Guilford, Connecticut.

...