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If we compare the bacterium Pseudomonas aeruginosa with a blue whale, we see that the bacterium has 10 million times more surface in relation to its volume than the whale.
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The bacterium has a lot of outsides, while the whale has a lot of insides.
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If we make a bacterium the size of a whale, our giant bacteria now has too much insides, and most of its inside is now very far from its surface.
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The oxygen our bacterium needs would never reach the inside before it would run out of oxygen.
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Our giant bacterium would just die.
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Still, being bigger has many upsides.
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But the size of cells is limited by the distance oxygen and nutrients can effectively diffuse to provide the inside with enough resources.
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So, life avoided this problem by forming multicellular structures.
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Because diffusion works better if you have many small units instead of one much bigger one.
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Over time, the cell buddies began to share work and specialize.
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But that still wasn't enough.
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The problem of diffusion and surface and energy production remained, limiting the size these first multicellular forms of life could attain.
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So, in order to become even bigger, life solved the diffusion problem by having holes and caves and tunnels and by folding in on itself.
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So diffusion could happen easily in each one of the cells.
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Take yourself.
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But your lungs have a surface area of about 70 square meters.
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They aren't like balloons, they're more like sponges filled with many tightly packed tiny balloons surrounded by blood vessels.
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When you breathe in, all these tiny balloons fill up with fresh air.
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Blood filled up with CO2 is pumped around the balloons.
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And then the magic of diffusion happens.
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The oxygen diffuses into the blood where it's picked up by red blood cells.
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And the CO2 diffuses out of the blood and into your lungs where it can be breathed out again.
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Your blood then carries oxygen-rich blood into the furthest corners of your body and picks up the CO2 waste.
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Diffusion in the body is effective at about 1 millimeter.
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So every cell in your body is at most 1 millimeter away from a blood vessel.
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So medium-sized animals like you need a lot of blood vessels to reach every cell in the body.
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Your body has around 100,000 kilometers of capillaries alone, the tiniest of your blood vessels, with a surface area of around 1,000 square meters.
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This is true for all parts of you that want to exchange something with the outside world.
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Your body needs surfaces to take in nutrients from your food, so your gut has the surface area of half a badminton court, roughly 40 square meters.
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The larger you are, the more hidden surfaces you need.
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Take a tree.
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Its way to stay alive is to create sugar out of thin air and sunlight.
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An orange tree with 2,000 leaves has a leaf surface area of 200 square meters.
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But the surface inside the leaves, where diffusion actually occurs, is 6,000 square meters.
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The roots of 1 square meter of grass add up to around 350 square meters of surface.
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If we look at the breathtaking diversity of life on this planet, it seems like everything is pretty different.
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But some basic principles are the same for everybody, and have not changed significantly for billions of years.
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Waste goes out and fresh fuel comes in.
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Big animals just need a lot of complex plumbing to make it possible.
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Fresh fuel is something we can all use from time to time, especially for our creativity.
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All it really takes is to try something new, and we have the perfect opportunity to get you started.
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We partnered with Skillshare, an online learning community that offers courses on almost any creative skill, such as design, illustration, animation, photography, and cooking.
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They have thousands of courses starting from every level, so wherever you are right now, there'll be something for you.
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Maybe you want to look behind the scenes of our animations, for example.
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We've made a couple of Skillshare classes that teach you how we animated scenes from our videos with video lessons classes and hands-on projects.
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Or if you'd rather look into illustration first, we recommend Adobe Illustrator.
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Level up your colors by Hayden Obey.
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But what you pick first doesn't really matter that much.
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The important part is to get started, have some fun, and get new inspiration.
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Unlimited access to all classes is only $10 a month with an annual premium membership.
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And the first 1,000 Kurzgesagt viewers to click the link in the description get a special treat.
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You'll get a free trial of Skillshare Premium.
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If you want to break out of your rut by exploring a new skill and support Kurzgesagt, give it a try.
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And we have something else to make your learning experience truly perfect, our new Ocean Explorer notebook.
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It has beautiful sparkly four-lettering and four illustrated infographic pages inside, taking you on a journey under the sea.
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Thank you for watching.
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Atoms are ridiculous and unbelievably small.
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A single human hair is about as thick as 500,000 carbon atoms stacked over each other.
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Look at your fist.
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It contains trillions and trillions of atoms.
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If one atom in it were about as big as a marble, how big would your fist be?
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Let's try something different.
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Look at your little finger.
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Imagine that its tip is as big as the room you're sitting in right now.
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Now, fill the room with grains of rice.
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One rice corn represents one cell of your fingertip.
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Now let's zoom in on the rice corn.
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And now, one cell is as big as the room you're in right now.
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Let's fill it with rice again.
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This is about the size of a protein.
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And now, let us fill all the empty spaces between the rice corns with fine grains of sand.
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This is roughly how small atoms are.
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Let us just pretend that atoms look like this for a minute to make it easier to understand.
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An atom consists of three elementary particles.
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Protons and neutrons bind together and form the atom core.
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They are made from quarks and held together by gluons.
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Nobody knows exactly how small quarks are.
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We think they might literally be points, like in geometry.
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Try to imagine them as being zero-dimensional.
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We suspect that quarks and electrons are the most fundamental components of matter in the universe.
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Electrons orbit the atom core.
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They travel at a speed of about 2,200 km per second.
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Like quarks, we think electrons are fundamental particles.
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99.99999999999999% of an atom's volume is just empty space.
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What we perceive as emptiness is actually a space filled by quantum fluctuations.
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These fluctuations have a fundamental impact on how charged particles interact.
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But that's a topic for another video.
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How much space do the core and electrons actually fill?
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If you were to subtract all the spaces between the atom cores from the Empire State Building, it would be about as big as a rice corn.
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All the atoms of humanity would fit in a teaspoon.
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There are extreme objects where states like this actually exist.
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In a neutron star, atom cores are compacted so densely that the mass of three suns fits into an object only a few kilometers wide.
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By the way, what do atoms look like?
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Electrons are like a wave function and a particle at the same time.
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We can calculate where an electron might be at any given moment in time.
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These clouds of probability, called orbitals, are where electrons might be with a certainty of 95%.
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The probability of finding an electron approaches zero the further we get away from the atom core.
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But it actually never is zero, which means that, in theory, the electron of an atom could be on the other side of the universe.
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Okay, wait a second.
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These strange thingies make up all the matter in the universe.
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