♫Hey♫ BOTH: What?

♫Come over here♫ ♫The Cat in the Hat is about to appear♫ ♫He's whizzing over to whisk you away♫ ♫On a fabulous journey today♫ He's coming!

♫And now he's arrived in the Thingamajigger♫ ♫The thing that he drives♫ ♫He's a cat and he's oodles of fun♫ ♫With his hairy helpers, Thing 2 and Thing 1♫ Yoo-hoo!

♫ Whoa!

Woo-hoo!

♫Can't stop the Cat in the Hat♫ ♫All of our adventures start like that♫ ♫ Wherever you're going, wherever you're at♫ ♫The Cat in the Hat knows a lot about♫ ♫He knows a lot about, he knows a lot about♫ ♫He knows a lot about that♫ (Children laughing) ♫ (Panting and laughing) Can't catch me, Sally.

Can too, Nick.

(Both laughing) (Laughing continues) Huh?

Tag, you're it!

It?

BOTH: Huh?

Ha!

If anyone's it, it's me!

It's the Cat!

The Cat in the Hat.

(Laughing) You run and I'll try to catch you.

Okay, but I need a rest first.

Me too.

We ran so fast my chest is thumping.

Let's see.

(Heart beating) Hmm... That thumpity thump is your heart boom, boom, booming.

Why's it booming so fast?

I don't know, but I do know someone who does.

(Gasping) Dr. Giggle.

My very own doctor.

He knows all about our insides.

Let's go visit him.

Your mother will not mind at all if you do.

(Laughing) Mom, can we go with The Cat in the Hat to find out about boom-boomy hearts?

MOM: Find out about boom-boomy hearts?

(Chuckling) Well, I would go in a heartbeat.

Okay, honey.

Thanks, Mom!

BOTH: We can go!

We can go!

I know!

I know!

To the Thingamajigger!

Buckle up!

(Horn honking) Flick the Jigger-mawhizzer!

(Laughing) (Horn honking) (Trumpets playing) Isn't this fun?!

ALL: Ya-hoo!

♫Here we go, go, go, go on an adventure♫ ♫The Thingamajigger is up and away♫ ♫ Go, go, go, go on an adventure♫ ♫We're flying with the Cat in the Hat today!

♫ To see Dr. Giggles, we'll be there real soon♫ ♫To learn why our hearts boom, boomy, boom, boom♫ ♫ Here we go, go, go, go on an adventure♫ ♫Go, go, go, go, go!♫ ♫ (Horn honking) Welcome to Dr. Giggle's house.

I hope the Doctor's in.

(Laughing) Huh?

Sure sounds like it.

(Laughing) Meet Dr. Giggles.

(Laughing) BOTH: Hello.

Hello.

(Laughing) Ah, the old tickle test.

What's the test for?Fun.

(Laughing) (Laughing) What can I do for you?

We have a question about our bodies.

Why do our hearts boom-boom, when we run fast?

To get to the heart of this matter, you'll have to listen closely to your hearts!

(All laughing) Listening to your heart through a tube, let's you hear better.

I prefer to use this.

It's called a stethoscope.

(Heart beating) (Laughing) (Heart beating) Wow, this stereoscope makes your heart sound loud and clear.

Don't you love that lub-dubby sound?

Oh, I do!

I do!

It's the sound of a healthy heart pumping.

Our hearts are pumps?

The pumpiest pumpers that ever pumped.

Why not go see for yourself?

You mean go inside someone's body?

Not someone.

Something.

When you want to explore inside bodies like you, whistle real loud for Thing 1 and Thing 2.

(Whistling) BOTH: Hello!

Why wants to volunteer?

Oooh, me!

Me!

Me!

Me!

Me!

Me!

Lub-dub, lub-dub, two hearts will not do, we have to choose one and that means you!

Yay!

Aww... Oh, never mind.

You can help Thing 2 get ready.

Yay!

Let's go, go, go to the Thingamajigger!

I can't believe we're going inside Thing 2's body!

(Chuckling) We'll need to shrink real small.

Press the super duper Shrinkamadoodle.

(Giggling) (Laughing) And we'll need the Subberyblubber on this incredible journey, Nick.

(Laughing) (Bell ringing) Now you're ready to go inside Thing 2.

Pull the Wizzermafizzer.

Cool!

(Chime sounding) NICK: Whoa!

BOTH: Wow!

FISH: We're inside Thing 2!

SALLY: In some kind of tube!

Our bodies are full of tubes big and small.

Where does this one go?

We're about to find out!

ALL: Wee!

Whee... Wow!

Cool!

Ooh!

SALLY: What's this red stuff we're floating in?

Beautiful blood!

BOTH: Blood?

Sure.

Blood's very important inside your body.

And if you cut your finger, a little can come outside your body too!

BOTH: Hi, Dr. Giggles.

I'm watching you on my scanamajammer.

You're this dot right here.

(Chuckling) (Heart beating) That lub-dubby sound's getting louder and louder!

This blood must be whooshing closer to Thing 2's heart!

The most exciting part of our ride!

Here we go, into the heart!

Hold on tight!

ALL: Yahoo!

Wee!

(All laughing) NICK: Flying through a heart is awesome!

(Laughing) You're leaving the heart now, but your ride is not done!

(Laughing) (All cheering) (Bubbling) SALLY: Where are we now?

And what's that whooshy noise?

Sounds like someone breathing.

It is!

You are near Thing 2's lungs, which can fill up with air like two big balloons!

Look!

The blood's changing color!

Hoo-hoo!

When it goes past your lungs, red blood fills up with air for your body to use from tip to toe!

So, every part of you gets a breath of fresh air.

(All cheering) BOTH: Wahoo!

SALLY: Hey, we're back in the heart again.

One side of your heart pumps blood to your lungs and the other side pumps it all around your... body!

(All cheering) SALLY: That was amazing.

Can we go again?

Again?

(Laughing) You can't help it.

Your heart never stops pumping blood around your body.

It goes round every minute.

Hold on to your hat!

(All cheering) Hey, that flappy flap made a "lub" sound when it opened.

(All cheering) And a "dub" sound when it closed!

Hoo-hoo!

Those flaps are like doors that open and close to keep blood moving forward, not backward.

(All cheering) So the "lub-dub" sound our hearts make-- BOTH: Is flappy flaps opening and closing.

Here we go!

(All cheering) ♫ Lub-dub, Lub-dub♫ ♫ That flappy flap sound♫ ♫It's made by your heart when it pumps blood around♫ We know our hearts make a sound, but what makes it go faster sometimes?

(Laughing) Time to get Thing 2 moving!

(Chattering) Oh... (Chattering) (Chattering) Wee!

The faster Thing 2 goes, the faster we go!

And the faster his heart makes that "lub-dubby" sound.

The faster you go, the more air-filled red blood you need to keep going!

BOTH: Which is why our hearts boom, boom, boom, when we run fast.

Yahoo!

♫ Lub-dub, lub-dub♫ ♫ That flappy flap sound♫ ♫It's made by your heart when it pumps blood around♫ Maybe it's time for Thing 2 to slow down?

That might be difficult.

♫Do-do-do-do♫ (Panting) ♫Do-do-do-do♫ ALL: Whoa!

(All yelling) How are we going to get Thing 2 to quit?

So his heart can slow down.

My mom reads me a bedtime story to help me slow down.

Why, that's a great idea.

(Chattering) (Chattering) (Chattering) (Chattering) (Chattering) (Chattering) (Yawning) (Chattering) (Snoring) (Snoring) That slowed things down nicely.

Your heart beats much slower when you're sleeping.

Time to get out of Thing 2.

Pull the Wizzermafizzer.

Press the Bigamaboodle.

(Laughing) (Horn honking) (Both laughing) That was awesome!

BOTH:Bye-bye!

Thanks, Dr. Giggles.

Come back anytime.

Goodbye.

See ya.

Bye-bye now.

♫ Lub-dub, Lub-dub♫ ♫ That flappy flap sound♫ ♫It's made by your heart when it pumps blood around♫ ♫The faster you move♫ ♫The faster it goes♫ ♫ Pumping red blood from your head to your toes♫ (Both laughing) (Panting) (Laughing) Time out.

(Heart beating) My heart's booming.

You mean, "lub-dubbing."

(Rumbling) But what's that sound?

My rumbley tumbley.

Isn't it fantastic?

Our bodies make so many great noises.

(Rumbling) (All laughing) Welcome to Hat Chat.

Today we're going to interview this wolf cub.

Hi!

Hi!

Hi there!

(Howling) Why are you howling?

I know!

There's a full moon and wolves howl at the moon, right?

Oh, no.

It's just a myth.

A myth?

Yeah, like a story.

Sometimes people think we howl at the moon, but it's not really true.

Then why did you howl?

Oh, I was just letting my mom know where I was.

That's how we wolves talk to each other.

Whoa!

Um... You're moving around a lot.

(Laughing) We wolf cubs play a lot.

It helps to teach us things we'll need to know, for when we get bigger.

Oh, I get it.

You're pretending to catch your food now, so you'll know how to when you grow up.

You got it!

(Laughing) And that's our interview with a wolf cub.

(Laughing) (Howling) (All howling) Psst, hey, kids!

Want to find out more fun stuff about animals, plants and, well, fish?

Go to pbskids.org for fun games, fascinating facts and fin-tastic activities!

Ha, ha, ha!

♫