Ms. Frizzle's kid sister Fiona takes the wheel at Walkerville Elementary, leading the class on wild adventures packed with science-fueled fun.
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00:00You're relaxed and feeling good. Next thing that you know, you're seeing
00:18octopus in the neighborhood. Surfing on a sound wave. Swinging through the stars.
00:30Take a left at your intestine. Take your second right past Mars. I'm the magic school bus.
00:36Navigate a nostril. Climb on the magic school bus. Spank a plant in two. Take that!
00:42I'm the magic school bus. Raft a river of lava. I'm the magic school bus. Such a fine thing to do.
00:50So strap your bones right to the seat. Come on in and don't be shy. Just to make your day complete,
00:57you might get baked into a pie. I'm the magic school bus. Step inside, it's a wild ride.
01:04Come on, ride on the magic school bus.
01:12Oh, no. No, no, no, no, no, no. This can't be happening.
01:19Arnold, what's wrong? Didn't you see? No. But, but... Arnold, if you didn't see it, we couldn't have seen it.
01:26I know, but I just thought maybe... Alarming. What happened? She's gone. We have to find her.
01:32Who's gone? Look, Ratney's gone. Oh, no. Carlos, not your lovable, huggable, wee, wittle,
01:39woodums, adorable pet rat. But, but, Arnold, you promised you'd watch her while we were on our field trip.
01:45I know, but I was getting a retreat and I turned around for one second and now...
01:51This is not good. Looks like things have changed in the blink of an eye.
01:56Maybe I should have gone on that field trip with you guys. Hmm. What to do? Let's see.
02:01I know. Let's take a look at what got us here in the first place. Huh?
02:09Hey, where are you going? Gotta keep you safe. Here you go. Hmm?
02:14Why do you need someone to watch Ratney, Carlos? Because I have baseball all week and my aunt's visiting.
02:20She thinks rats are, quote, ugh, ugh. Looks like a full-time job.
02:24Wanda's right, Miss Frizzle. So there's no way I can go on a field trip today.
02:28But I was thinking we'd bring the trip to you, Arnold. To me? So I wouldn't have to go anywhere?
02:33Bullseye. Plus, who's up for a trip inside Arnold's eye? Really?
02:38Cool. You want to go into my eye? Yeah!
02:42Eh. Beats my having to shrink. Always makes me woogly. Yes!
02:46Oh, this is gonna be awesome! The eyes have it. To the bus, everyone!
02:51Yeah! Let's get it! Phew.
02:55Since what our eyes do is let in light, let's be what we see. Let's become light.
03:08In we go through our window to the world of the eye's cornea.
03:23Wow. Are we in water? Sort of. According to my research, we're in the aqueous humor.
03:42Yes, a liquid that feeds the eye tissues and helps keep its shape. Speaking of shape, who's feeling bouncy?
03:48Me! Me! I do!
03:56Hey, check this! Arnold has his own mini trampoline! Actually, this is your friend's lens.
04:04Like the lens in a camera? Kind of.
04:08The lens in your eye does something similar. It focuses light. Now, let's focus on what happens next.
04:13Snack time, Ratty! Now, where's your stinky cheese?
04:18There it is!
04:20Awesome! The lens got flatter all of a sudden.
04:24Which is what happens when your eye focuses to look at something far away.
04:29It's amazing!
04:40Cool!
04:43The lens is curved again.
04:45Which means he's focused on something closer.
04:49Could we get closer?
04:51Good question, Tim. Let's find out.
05:04Whoa! Now what's going on?
05:10Arnold closed his eyes. That hole gets wider when there's less light.
05:18And the more light there is, the smaller the pupil gets. And lightning!
05:27Makes total sense! The pupil gets wider when it's dark and we need to let in more light to see.
05:35And gets smaller when there's lots of light to see with.
05:41Let's see what else is out there.
05:44Wow! Where are we going?
05:47The same place the light is going.
05:49How about a nice garnish?
05:57Plus a nice beverage.
06:02Is that how we see things? Upside down?
06:05You bet your retina!
06:06Light bounces off things around us and into our eyes to make a picture.
06:18And then our brains flip the picture right side up again.
06:21Wow!
06:24Like how a picture comes out of a movie projector.
06:27I don't know. I think it looks fine.
06:29But there's a little more to it. And when I say little...
06:34I mean little!
06:40What are these things over here?
06:42According to my research, those are rods. They show us shape and movement.
06:46They're super sensitive to light.
06:47You know, as my great-uncle Conan Rod used to say,
06:50more by day, less by night. Photoreceptors see the light.
07:02And the cone-shaped ones react to color.
07:05Illuminating! So rods give us night vision and cones give us color vision.
07:10I just had a vision of Arnold freaking out.
07:14To the bus!
07:20No, no, no, no, no! This can't be happening!
07:30I only took my eyes off her for a second!
07:33That's enough. She's one fast rodent.
07:35There! The rain spout!
07:40We have to follow her!
07:41But how do we go up a rain spout?
07:43Uh, bus? Magic? Shrinkable?
07:46To the bus, class!
07:49Bus, do your stuff!
08:11Ratney! Come to Carlos!
08:18Atta girl! There! Gotcha!
08:24Phew!
08:25Okay, Ratney, hang tight. We'll get you back safe and sound in no time.
08:31Phew! I've made enough mess for one day.
08:33Can we get full size again and pretend this never happened? Like, now?
08:37Whatever you say, Arnold.
08:45No, no, no, no, no, no!
08:48I've got to make her regular size! Where's the small meter button?
08:57Phew! Glad that's over.
09:04Where'd she go?
09:05Uh, Arnold, you do know that the small-inator button is right beside the invisible-inator button, right?
09:12Is it?
09:13So, which button did you press?
09:16I must have pressed invisible!
09:18Which means she's still giant!
09:20Only now she's invisible!
09:22We just lost a giant, invisible rat!
09:26Oh, no.
09:30Ratney! Where are you, girl?
09:33She could be anywhere by now!
09:35We'll find her! Everybody keep your eyes peeled for clues!
09:38You know, wouldn't a giant, invisible rat cause a lot of damage? Shouldn't it be obvious where she went?
09:45There! Something knocked over those garbage bins!
09:48Good eye, Jodi!
09:49Ratney must have gone that way! Let's go!
09:57Whoa! Ratney must have smashed into that tree!
09:59But those branches have been down for weeks!
10:02Looks like Ratney's claws popped a walk-a-wheel burger balloon!
10:05That balloon has always been deflated!
10:08If only there was a way to get a better look around!
10:10Look! An eagle watching us!
10:13I wish we had eagle eyes right now.
10:15I bet we'd see Ratney's path of destruction from up there!
10:18Or lack of it.
10:19Come on, you guys! Don't you think?
10:21That's it! Any way to get eagle-vision, Ms. Frizzle?
10:23Let's just see!
10:33Whoa!
10:35No wonder people say eagle eyes! The world this bird sees is amazing!
10:39Wow!
10:41What's that? A blind spot?
10:43I think you're right, Carlos.
10:45Eagles have a great field of vision, but they can't see behind them.
10:49But everything else is so crisp and clear!
10:52Ah, yes. The teeniest things she sees with ease.
10:57Like those birds down there!
11:00Whoa! That bird is really far away! How can we see that?
11:04According to my research, eagles change the shape of their corneas to zoom in on faraway objects.
11:09Kind of like how Arnold's lens in Cornea did, only now it's to the max!
11:14Like a zoom lens on the highest megapixel camera ever!
11:17Perfect for spotting food from way up in the sky when it's hungry!
11:21I bet Ratney's hungry, too.
11:23Well, it looks like someone took a big bite out of the eagle cheeseburger!
11:27Looks like someone took a big bite out of the eagle cheese factory sign!
11:32Um, isn't that part of the design?
11:35Besides, Arnold, you do know that the sign isn't really made of cheese, right?
11:39Yeah, but does Ratney? To the cheese!
11:44Any sign of her?
11:46No, but that chipmunk saw us coming a mile away!
11:52Miss Frizzle, does this thing have chipmunk vision, too?
11:54Aye-aye, Captain!
11:58Startling! Eyes on the side of a chipmunk's head means we can see in almost every direction at the same time!
12:05Wow! Wow!
12:09Makes sense. Chipmunks have to see trouble coming from every which way so they don't become some predator's lunch.
12:16And everything looks like it's in slow motion!
12:21You see, chipmunks process light faster than we do so they can react sooner than we do.
12:26It's like nature's giving them a head start!
12:29It looks like Ratney just bumped into that woman!
12:33Or maybe she just lost a heel! Come on, you guys, let's be realistic!
12:38Hurry that-a-way!
12:48Maybe Ratney was looking for shelter and snuck into that barn!
12:52Only one way to find out!
12:57Whoa! It's dark in here! The chipmunk can't see anything!
13:02According to your research, which animal has the best night vision?
13:05Something nocturnal, obviously.
13:08I don't know yet. Give me a sec.
13:10I told you, I'm-
13:12Ugh! Would you just-
13:14Aaaaaah!
13:17Owl attack!
13:18Aaaaaah!
13:20Which one? Which one?
13:27Well, that's one way to escape an owl attack!
13:30Quit thinking, Arnold.
13:31I had a feeling I'd end up in an eyeball before this day was over.
13:34This is perfect! We can check out the barn through the owl's eyes!
13:38Illuminative!
13:41The owl's retinas barely have any of the color cones we have!
13:45All rods, the ones that are super sensitive to light!
13:48That must make for really good night vision!
13:51Perfect for hunters in the dark!
13:53Look, by the hay! Footprints!
13:55Yeah, probably from a horse! Or a cow! Or-
13:58A giant invisible rat!
14:00Seriously, guys?
14:05Follow that rat!
14:12Ratnee is an indoor rat. She probably went in the house.
14:15Yeah, we just can't go in there and be all-
14:17Excuse me, have you not seen a giant invisible rat?
14:20So, how do we get Indy to look around and not be noticed?
14:26Hello, Harold. What's the latest buzz?
14:29A fly named Harold?
14:31Oh yes, Harold and I go way back. We used to go fishing together.
14:34That's it! Let's be a fly on the wall!
14:37That's another great idea, Arnold!
14:50Wow!
14:54So bizarre! It's like we have thousands of eyes!
14:57We do, see? They're called compound eyes.
15:00Each part makes a little picture and the fly's brain puts them all together.
15:09So, why is it all blurry?
15:11To stay safe, a fly needs to see movement, not details. That's why-
15:21We can do that!
15:23Ha! We totally saw him coming!
15:25Too easy!
15:29Everything's moving in slow-mo again!
15:32It's like having a power!
15:34We are super fly!
15:37Yeah! Let's do it again!
15:39Yeah! Kiss us again!
15:43Am I the only one who doesn't think this is fun?
15:46Yes!
15:47Time out!
15:50If a hippo says invisible rat were here, this farmer would not be wasting his time on a fly!
15:55Keisha's right! Let's check if Ratney's outside!
15:58You guys, shortcut straight ahead!
16:05What? What happened?
16:08Whoa! What happened? We're in a spider web!
16:11Compound eyes didn't help us see that coming!
16:13I guess we'd be one crunchy lunch for Spidey McSpider!
16:18Uh, what is it, Arnold?
16:20Spidey McSpider!
16:23Good eyes, Sparrow. And goodbye, spider.
16:26Phew! Edifying! Can we use that observation to help us see?
16:30Yeah! Let's go!
16:32Let's go!
16:34Let's go!
16:36Let's go!
16:38Let's go!
16:40Let's go!
16:42Let's go!
16:44Let's go!
16:46Let's go!
16:48Let's go!
16:50Edifying! Can we use that observation to our advantage?
16:53Well, if we all turn into sparrows, we could fly around and cover more ground!
16:57Okay, Carlos. From your words, into birds!
17:00Bus, do your step!
17:09Wow! It's like I can see forever!
17:13Wow! Everything looks so different!
17:16Dazzling! Why can't we see like this?
17:19Remember Arnold's red, green, and blue cones?
17:21Some birds have a fourth cone to see the ultraviolet color spectrum that we can't!
17:33Cool! Maybe it helps them find food!
17:38Check it out! It must help them find partners, too!
17:42I always thought sparrows were bloody brown!
17:45But look how they look to each other!
17:47Hey, if some animals see invisible colors, you think any of them can see invisible rats?
17:52Hey, yeah! Miss Frizz, are there other animals that see differently than people?
17:56Are there? Of course there are! Let's have a look-see!
18:06Whoa! It's so beautiful!
18:12The colors lead the butterflies to the pollen and the flowers!
18:17Yes!
18:19Rat vision! Now we're seeing how Ratni sees!
18:23Wow! Dude totally needs glasses!
18:26Disheartening! Everything that's red or green to us looks the same to Ratni!
18:31According to my research, rats only have two types of cones.
18:34Regular green cones and blue cones that only read blue ultraviolet light.
18:38No wonder she didn't care when I painted her cage that awesome rainbow!
18:42Yep, in rat world, good vision isn't that important since they rely on their heightened sense of touch and smell.
18:48Wait, that's it! Instead of finding Ratni, let's have Ratni find us!
18:52Compelling! How do we do that?
18:54One word! Stinky cheese!
19:00Here's the plan! We dump the cheese in the hole.
19:03Then we camouflage the hole with a blanket.
19:06Giant invisible Ratni spells the cheese, steps on the blanket, and boom! Falls in the hole!
19:11Then we shrinkify and visibilify her!
19:14Sounds good! Only, where's the blanket?
19:16I didn't get that far yet. I might have the perfect thing!
19:25Ta-da!
19:26Uh, just stating the obvious here, but a red blanket doesn't exactly blend into green grass.
19:32Troubling! How are we gonna trick Ratni with that?
19:35Okay, another new plan!
19:37Wait, rat vision! Miss Frizzle?
19:39No problem. Some goggles to help you ogle, rat style.
19:43Wow!
19:44Cool!
19:45Wow, look at that!
19:46Now, let's see what Ratni sees!
19:52Yes! That shade of red just blends in with the grass!
19:57For Ratni's eyes, it's perfectly camouflaged!
19:59And now, we wait!
20:01Steak out!
20:06This should work! There's no way Ratni can resist stinky cheese! Right, Ratni?
20:13Ratni!
20:14You're okay!
20:15Oh, I missed you!
20:18Ratni, you are one rodent for sore eyes!
20:23So, she isn't giant!
20:25Or invisible!
20:28She was just the usual, adorable, visible Ratni!
20:32She was just the usual, adorable, visible, rat-sized Ratni this whole time!
20:36Understandable! Arnold must have hit the shrink button a split second before Ratni ran away!
20:41In other words, he didn't hit the invisible-inator at all!
20:48Yeah, I have a lot of I told you so's to get through here!
20:51I told you a giant rat didn't knock over the garbage cans!
20:54I told you a giant rat didn't take a bite of the sign!
20:57I told you!
21:02What's in there?
21:03Edith, is that you? I think it is!
21:06Oh, how fantastic! How wonderful!
21:09What's fantastic? What's wonderful? And who's Edith?
21:13Well, a long time ago, when I was a traveling magician, I did a world-famous disappearing act,
21:17but it didn't always work out as planned.
21:20I always wondered what happened to that elephant.
21:32Hi, I'm looking for the Magic School Bus.
21:34Is this the Magic School Bus?
21:36Magic School Bus?
21:37Is this the Magic School Bus?
21:38Hi, I'm looking for the Magic School Bus.
21:42Magic School Bus?
21:43Magic School Bus?
21:44Magic School Bus?
21:45Magic School Bus?
21:46Magic School Bus?
21:47Magic School Bus?
21:48Magic School Bus?
21:49Magic School Bus?
21:50Magic School Bus?
21:51Magic School Bus?
21:52Magic School Bus?
21:53Magic School Bus?
21:54Magic School Bus?
21:55Magic School Bus?
21:56Magic School Bus?
21:57Magic School Bus?
21:58Magic School Bus?
21:59Magic School Bus?
22:01Professor Frizzle.
22:03Hi, Professor. I have a couple questions about the eyes episode.
22:07Animals can't tell us what they see, so how could we possibly know how they see?
22:11Well, some things we can tell from observation.
22:13Eagles spot prey from miles away, so we know they have amazing long-range vision.
22:21Other times, scientists create behavioral experiments to study animal vision.
22:26For example, scientists fed moths from artificial blue flowers.
22:31They then mixed the blue flowers in with all kinds of flowers and shut the lights off.
22:36Sure enough, by the tiniest amount of starlight, the moths flew directly to the blue flowers.
22:42What about animals that don't have any eyes at all, like earthworms or starfish? How do they see?
22:48They may not have eyeballs, but they do have light receptors.
22:51That's how starfish don't stray far from home, and how earthworms sense light or dark.
22:57Could scientists invent something so humans can have super vision one day?
23:01We're on our way. Retinal implants can increase brightness and even help some blind people see.
23:08Just think, humans see less than 1% of the light spectrum in the universe.
23:13Curious, inventive people like you?
23:15Maybe one day our bionic vision will allow us to see UV light, infrared,
23:20zoom in and out like a camera, or even see right through objects.
23:25What are you up to right now anyway?
23:29Oh, nothing.
23:32Just socking away a little present for safekeeping.
23:35And to find out, stay tuned.
23:45NASA Jet Propulsion Laboratory, California Institute of Technology
24:15NASA Jet Propulsion Laboratory, California Institute of Technology
24:45NASA Jet Propulsion Laboratory, California Institute of Technology