Nell Greenfield Boyce

You've got different environments.

I mean, is it one explanation for all of them?

I mean, to me personally, it seems like

It could be a bunch of things.

I mean, she's been experimenting with different species of oaks to see what effect there could be to grow them with different levels of nitrogen in the soil.

Like, how could that affect leaf color?

I mean, there's just like a lot of cool basic science people could do.

Yeah, maybe we can check in on Nikki's oaks.

I mean, I will totally be looking around at the autumn leaves with new eyes because, you know, people notice things and scientists notice things.

And that's how science happens.

It's all around you.

The mystery, Emily.

The mystery.

Do you think you will find a perfect red leaf this fall?

I mean, I'll look.

I don't know.

If I find it, I'll send you a picture.

Jared Isaacman is a wealthy entrepreneur who's been to space twice in capsules operated by SpaceX, the company run by Elon Musk.

Isaacman is the first private citizen to ever go on a spacewalk.

When President Trump previously withdrew Isaacman's nomination, he said at the time he had concerns about Isaacman's political leanings.