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A blue whale doesn't have bigger cells than a hummingbird, just a lot more of them.
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Cells have to do a lot of stuff to stay alive, and they need energy to be able to do so.
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To get this energy, animal cells convert food and oxygen into usable chemical energy.
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This happens in our mitochondria, the powerhouse of the cell.
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They're like little coal engines that spit out tiny ATP batteries, which the cell can use for almost everything it needs to do.
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Just like an engine, mitochondria get really hot while working.
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In human skin cells, they reach a scorching 50 degrees Celsius.
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And some of our cells have up to 2,000 mitochondria which are radiating their heat into the cell.
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So being alive generates a lot of heat.
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The more cells you have, the more heat your body generates in total.
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If our bodies didn't find ways of losing this heat, we would be cooked from the inside and die.
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But this is a problem for bigger animals because of the way bodies change as living beings scale up.
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Animals have three properties here that are important.
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The thing that's hard to wrap your head around is that when things grow, their insides grow faster than their outsides.
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Imagine a fleshy cube.
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If you double the length of its sides, its surface and volume do not double.
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In fact, the surface is now four times the original size and the volume of the cube eight times the original size,
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So why is this a problem for big animals?
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So if we make our mouth the size of an elephant or 60 times longer, it has 3,600 times more surface from which to lose heat.
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But it has 216,000 times more volume filled with trillions and trillions of new hot mitochondria that produce more heat.
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Our mouse is very dead very fast.
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But big things like elephants exist.
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So how do they deal with the heat?
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For one, they evolved ways to get rid of energy more easily, like huge flat ears that have a lot of surface where heat can escape.
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But that's not enough.
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Nature's solution is actually very elegant.
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Elephant cells are much, much slower than mice cells.
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The bigger an animal is, the less active its cells are.
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it's clearly visible.
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It's not 100% accurate, but it is a good rule of thumb.
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Elephants are huge meat sacks filled with trillions and trillions of little coal ovens.
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So they keep the ovens just active enough to keep them running and never at full power.
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Their whole metabolism is slow.
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Things move at a nice, chill pace.
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Small animals need to go the exact opposite way.
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If you're small, you have a lot of surface area compared to not a lot of volume.
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You don't have a lot of cell ovens and lose the heat they produce very fast.
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So very tiny mammals came up with a very extreme solution.
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Meet the Etruscan shrew, the smallest mammal on Earth.
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With a body length of 4 centimeters, it only weighs about 1.8 grams, as much as a paperclip.
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It's a tiny, ridiculous being.
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It would basically cool off immediately, so its cells run on overdrive to stay warm.
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Its tiny ovens are filled at maximum capacity.
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Its heart beats up to 1,200 times a minute, and it breathes up to 800 times a minute.
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This creates an extreme need for energy, so the shrew has to eat constantly.
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After only four hours without food, it starves to death.
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And while an African elephant consumes around 4% of its body weight in food each day, our shrew needs 200% of its body weight in food a day just to survive.
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Imagine having to eat 2,000 Big Macs a day, more than one a minute.
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So a cubic centimeter of shrew needs 40 times more food than a cubic centimeter of elephant.
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If an elephant's cells suddenly become as active as the cells of a shrew, a crazy amount of heat would be generated.
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All the liquids in the elephant would suddenly start boiling, and then it would explode in an impressive explosion of steaming hot, burning elephant parts.
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In reality, before an explosion occurred, the proteins making up our cells would probably be denatured and stop producing heat.
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But a meat explosion is much more fun than melting an elephant into a mass of hot goo.
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Regardless, the scaling of the speed of metabolism happens everywhere, even in places we don't expect, like pregnant women.
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A baby in the womb of its mother behaves as if it were a part of her.
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Its cells have about the same metabolic rate, the same speed of life as its mother's organs.
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It is truly a part of a bigger whole rather than an individual.
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Until it is not anymore.
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The very moment a baby is born, a switch is flipped and all its internal processes speed up rapidly.
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Thirty-six hours after birth, the baby's cells have the same activity rate as a mammal at size.
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Babies literally transition from being an organ to being an individual in mere hours.
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But there's one thing where big and small things are very similar.
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Elephants tend to have a similar amount of heartbeats over their lifetime, typically around one billion.
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So while the shrew and elephant are very different, they share a similar number of heartbeats over the course of their lives.
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Their speed of life is the opposite and somehow still the same.
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And for a video in which we made elephants explode for no good reason, this is the most romantic ending we could come up with.
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Nothing in the universe is static.
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In the Milky Way, billions of stars orbit the galactic center.
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Some like our sun are pretty consistent, keeping a distance of around 30,000 light-years from the galactic center, completing an orbit every 230 million years.
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This dance is not an orderly ballet, more like a skating rink filled with drunk toddlers.
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This chaos makes the galaxy dangerous.
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Our solar neighborhood is constantly changing, with stars moving hundreds of kilometers every second.
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Only the vast distances between objects protect us from the dangers out there.
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But we might get unlucky in the future.
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At some point, we could encounter a star-going supernova, or a massive object passing by and showering Earth with asteroids.
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If something like this were to happen, we would likely know thousands, if not millions of years in advance.
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But we still couldn't do much about it.
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Unless we move our whole solar system out of the way.
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To move the solar system, we need a stellar engine, a megastructure used to steer a star through the galaxy.
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It's the kind of thing that might be built by an advanced civilization with Dyson Sphere level technology that's thinking about their future millions of years ahead of time.
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But how do we possibly move the hundreds of thousands of objects in the solar system?
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The good news is, we can ignore all of that.
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We only need to move the Sun, all the other stuff is glued to it by gravity and will follow it wherever it decides to go.
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There are lots of ideas about what a stellar engine might look like and how it would work.
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We've picked two grounded in our current understanding of physics that could be built in theory.
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The simplest kind of stellar engine is the Shkadov thruster, a giant mirror.
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It works on the same principle as a rocket.
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Like rocket fuel, the photons released as solar radiation carry momentum.
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For example, if an astronaut turned on a flashlight in space, it would push them backwards very, very slowly.
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A stellar engine will work a little better than a flashlight because the Sun produces a lot of photons.
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The basic idea of the Shkadov thruster is to reflect up to half of the solar radiation to create thrust and slowly push the Sun where we want it to go.
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In order for the Shkadov thruster to work, it must be kept in the same place, not orbiting the Sun.
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Although the Sun's gravity will try to pull it in, it would be supported by radiation pressure which props the mirror up.
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This means the mirror would have to be very light, made of micron-thin reflecting foil from materials like aluminium alloys.
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The mirror's shape is important too.
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Enveloping the Sun in a giant spherical shell wouldn't work because that would refocus light back to the Sun, heating it up and creating all sorts of unpleasant problems.
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Instead, we use a parabola, which sends most of the photons around the Sun and in the same direction, which maximizes thrust.
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To prevent accidentally burning or freezing Earth with too much or too little sunlight, the only safe place to build a Shkadov thruster is over the Sun's poles.
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This means we can only move the Sun vertically in the plane of the solar system and one direction in the Milky Way, which limits our travel options a bit.
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But that is basically it.
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