You're listening to Brains On. We're very serious about being curious.

Brains On is supported on part by a grant from the National Science Foundation.

Hi Earthworm, thanks for coming to my third birthday party.

Oh, June Bogg looking sharp. Thanks for dressing up for my third birthday.

Oh, done beetle. You made it. Hey, Lady Bogg, where do I put my present?

You can leave it over there. It's not. No, no, it's not done. Oh thank goodness.

It's a drawing of Dung. I made it myself. It will look great in your living room.

Oh great, just what I needed. Excuse me. Snail, snaily, how are you?

Can you believe I'm already three? Where does the time go? Can you believe Lady Bogg three,

three years old? What a load of fertilizer. What do you mean? Come on, see how many spots he has?

Count them. One, two, three, four, four. Exactly. Everybody knows

a Lady Bogg is as old as the number of spots that it has. It's a fact. He's four. I don't know why

everyone's pretending he's three. Oh, and I didn't see you there. So glad you could come.

Are you kidding? I wouldn't miss it. By the way, you just look so great. For three.

Oh, Shocks, you're the sweetest. Later. Bye, Bestie. Save me some cake. What a foamy.

This is part one in a series called Proof It. How to find the facts.

We declare your eyes and test for errors. What if what we say feels right?

Okay, sure, but let's just shine a light. We can prove it. We can prove it. Let's check the facts and prove it.

We can prove it. We can prove it. Let's check the facts and prove it.

Proof it.

Hi, I'm Molly Bloom and this is Brains on from American Public Media. My co-host today and for

this whole series is 12-year-old Katie from Fairfield, Connecticut. Welcome, Katie. Hi. We're

...