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 week of Halloween.

In the spirit of spirits, we'll take a walking tour of one of the great cemeteries in the U.S. Woodlawn Cemetery in the Bronx, New York, where over 300,000 people don't live, including Duke Ellington, Miles Davis, Herman Melville, F.W. Woolworth, Fiorella LaGuardia, Batmastersson, Joseph Pulitzer, and lots of others.

But since we're science people, our focus is going to be on the geology, especially that of the rock used in the over 1,300 opulent mausoleums to be found at Woodlawn.

You'll hear the voice of Susan Olson,

she's the executive director of the Friends of the Woodlawn Cemetery, and you'll hear geologist

Sidney Horanstein. He's the Environmental Educator Emeritus for the American Museum of Natural

History here in New York City. Now let's go to the cemetery.

This monument for Matthew Borden, Matthew was the Calico King of Fall River, Massachusetts, made his millions in fabric.

This monument was constructed in 1904, the architectural firm Carrera in Hastings, who give us the New York Public Library.

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