00:11Harness the power of the potato to tell time.
00:15Rex, how we doing?
00:16It's half past his eyeball!
00:18Impressive!
00:18This is ridiculous.
00:19What's going on, fellas?
00:20Buzz?
00:21Buzz?
00:21We're just making a potato clock.
00:23Ah, yes.
00:24The vegetable acts as an electrochemical battery,
00:26converting chemical energy into electricity
00:28by spontaneous electron transfer.
00:32Yeah, you can do it that way.
00:34I'm out of here.
00:34And you don't love a science?
00:36Buzz, how do you know so much about electrochemistry?
00:38Well, I saw hundreds of experiments
00:40while I was aboard the International Space Station.
00:42Oh.
00:42Yeah, let me show you.
00:46Buzz Lightyear, Mission Logs!
00:48Episode 3, The Science of Adventure!
00:53Ooh, cool!
00:56Mmm, look at this.
00:58What are they doing, Buzz?
01:00Scientific experimentation.
01:02A noble pursuit, indeed.
01:04Amazing.
01:05Wow.
01:05What other kind of experiments do they do?
01:07Well, they also test new technologies.
01:10Grow plants in space.
01:11Experiment with bacteria and plasma.
01:13They even do research about the impact of microgravity on humans.
01:18Human experimentation?
01:19Human experimentation?
01:19It's not like that.
01:21On the ISS, everyone participates in a series of experiments studying how humans respond to life in space
01:26and how we can help them stay healthy now and on future space expeditions.
01:30Wow, that's a lot of experiments.
01:32But why do we have to do them up there?
01:34Well, by doing experiments on the ISS, you change one very important variable, gravity.
01:40Ooh.
01:40That variable can mean big changes to scientific outcomes.
01:44Hey, what you doing there?
01:45Earth science.
01:46Right now, we're tracking the polar icebergs that broke away from Antarctica.
01:49Antarctica?
01:50Wow.
01:51That's a nice view from up there.
01:53It's a great view.
01:54You can see everything from orbit 220 miles above the Earth.
01:57That's pretty high up.
01:58How fast did you say you were going?
02:00Oh, just 17,500 miles per hour.
02:04Wow.
02:04That's super fast.
02:06How did you ever get down from there?
02:08Very carefully.
02:09You can take either the Russian Soyuz capsule to Kazakhstan or the American Space Shuttle to Cape Canaveral.
02:17I took the shuttle.
02:18The descent process is pure physics.
02:20When the shuttle detaches, it's still orbiting the Earth at 17,500 miles per hour, just like the ISS.
02:26In order to get out of orbit, the shuttle has to slow down a lot.
02:31Oh, you really got to slam on those brakes, huh?
02:33Uh, brakes don't work in space, Han.
02:34Oh, I knew that.
02:35Those clever NASA scientists, physicists, and engineers designed a way for the space shuttle to slow down using a combination
02:41of friction and reverse power.
02:46Discovery, you are go for the deorbit burn.
02:48Discovery copies go for the deorbit burn.
02:50Whoa.
02:52What was that?
02:53Well, when the shuttle cuts through the atmosphere, it's still going faster than the speed of sound, so it creates...
02:59A sonic boom.
03:00I read about that on the NASA website.
03:02Runway inside, Houston.
03:04Discovery, we copy.
03:12When we touch down, we're still going over 200 miles an hour.
03:15Luckily, there's a parachute to slow us down.
03:17Yay!
03:19You're hot!
03:19Welcome home, Discovery.
03:21Congratulations on an extremely successful mission, stepping up science to a new level on the International Space Station.
03:26Mission Accomplish!
03:27Oh, our mission didn't end there, Ham.
03:29Soon, I was called away to test the atmosphere in a strange and magnificent land inhabited by giant mice.
03:36They called it Disney World.
03:39What the?
03:39Whoa.
03:40Experiments of microgravity, Earth science from a spaceship, the physics of a shuttle descent, and giant mice?
03:47What a trip!
03:49It's like a dream.
03:50It's no dream, Rex.
03:52It takes all kinds of scientists, physicists, astronauts, giant mice, and many others to make these dreams a reality.
03:58You guys were right about this science thing.
04:00I've got my own experiment.
04:01Great.
04:02What is it?
04:02How to make a pig fly.
04:03Hey, what's going on?
04:05Hey, what are you doing?
04:06Tell us what the weather's like.
04:08For more science, visit this NASA website.
04:11Oh, look at me.
04:12I'm an astro pig.
04:20I'm an astro pig.
