Hi, it's Molly from BrainsOn and Smash Boom Best with an important request for the curious

adults listening in today. As you may know, the BrainsOn universe is public media.

Philanthropic donations from you help power this show and so many others that our team created

this year. When you donate today, you could choose an extra special thank you gift,

maybe kids stop listening for a second if you want a surprise. This gift would be a personalized

message from me for the BrainsOn universe fan in your life. And it will get there in time

for the holidays. Find more details and make your donation at brainson.org slash donate.

That's brainson.org slash donate. Thank you so much for your support.

You're listening to BrainsOn, where we're serious about being curious. BrainsOn is supported

on part by a grant from the National Science Foundation. Warning! The following episode asks the

question, why are butts and poop so funny? Obviously, there are lots of button poop jokes.

If this is not your thing, we suggest any other episode of BrainsOn. Except the other one about

poops. Or the one about sewage. Or either of the two part episodes. But the rest should be fine,

right? Sure. Now on with the show. Hey, part! How are you doing?

As I live and beat if it isn't the lungs. Oh, heart, you're such a breath of fresh air.

Hey, thanks for hosting this Body Parts party. We really don't hang out enough.

I know. I was just telling the eyes I'm always too busy working. In fact, I'm working right now.

Let's not gonna pump itself, am I right? Tell me about it. I'm multitasking too.

Gotta keep those breaths coming and going.

Hey, party people. Oh, hey, it's butt.

Butt's up, everyone. Hey, sorry I'm late. I feel like I'm always running a little behind.

Behind because he's the butt. So good. Yeah, I just ran over from hanging out with my

...