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.

This is Scientific American Science Talk posted on April 27, 2020.

I'm Wade Gibbs.

100 years ago, a great debate took place between two eminent astronomers of the day,

Heber Curtis of the Lick Observatory in Northern California,

and Harlow Shapley of the Mount Wilson Observatory in Southern California.

Speaking to the National Academy of Sciences in Washington, D.C., the two dueled over the

question of how big the universe is, and whether it is composed of millions of far-flung galaxies

or just one giant galaxy. Curtis won that debate with his argument that the Milky Way is

but a single, isolated drop in a vast cosmological ocean.

Now, NASA is commemorating the centennial of this great debate by releasing perspectives from 14 prominent astronomers

...