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But the real boss of the solar system is the Sun.
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A billion times smaller than you, clearly the boss of our body, is a DNA strand containing all the information making your life possible.
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You're right in the middle between the most important factors keeping everything alive.
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From here on, things just kind of stop making sense.
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A billion is already too much, but now everything just seems to mean a lot.
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The supermassive black hole at the center of our galaxy, Sagittarius A-star, is 14.5 billion times bigger than you.
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A hydrogen atom is 15.5 billion times smaller than you.
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But the thing is, we're not even close to being done, and it's not impossible to get at least a sense of how these scale.
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The solar system is 22 trillion times larger than you.
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On the other end of the scale is the wavelength of low-energy neutrinos released from fusion reactions in our Sun.
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About 100 trillion of them are passing through you every single second, like ghosts a trillion times smaller than you, basically never hitting any of the particles inside you.
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If you moved through the solar system in a straight line, you probably wouldn't hit anything either.
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Although things are beginning to get really weird now.
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A single proton at the heart of the hydrogen atom is almost exactly one quadrillion times smaller than you.
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If the proton were as big as you, the hydrogen atoms would be taller than 12 Mount Everest's.
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On the other end, we meet something that just breaks human brains, the incredible vastness of space.
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We just have no reference for these distances at all.
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The distance to the closest star to Earth, Alpha Centauri, is not one quadrillion times in the other direction from the tiny proton, but 24 quadrillion.
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Space is just so large, it's kind of mean.
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And it goes on like this.
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A quintillion times smaller than you is the strange world of the quarks.
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The proton is not actually like a tiny ball, but kind of just a ripple on the surface of the ocean of quarks.
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Every moment, countless quarks pop into existence, along with their antiparticle enemies, before doing furious battle and annihilating each other in an instant.
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Because the harder you look for them, the more quarks seem to appear.
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We're simplifying so much, it's like a lie anyway.
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However we choose to illustrate this, it's wrong.
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What actually is a quark?
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What does it look like to human minds?
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Nobody knows.
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As you sit here confused, let's look up again.
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The ocean of quarks in a proton, inside a single atom of a single cell of your body, is as small to you as you are compared to a sphere around 174 light years across, containing about 16,000 stars.
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And this is just a tiny speck of dust to our galaxy.
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The Milky Way is close to one sextillion times larger than you.
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At the opposite end, we have particles a sextillion times smaller than yourself.
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We're getting to the end.
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The observable universe is 93 billion light years in diameter.
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But it's still finite.
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It's only 465,000 Milky Ways side by side.
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If you were the size of our galaxy, the observable universe would only be a day's drive across.
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On the other end of that scale, we have the tiniest particle ever detected.
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A proton traveling so close to the speed of light, it got squished into a pancake.
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We're at the border of things that we have evidence for.
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Are you truly in the middle of everything?
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The theoretical smallest physical distance is the Planck length, a hundred million times smaller than even the pancake proton.
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But we don't know if it's real, only that our theories of the universe break down here.
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Likewise, on the other end, does the bigness of the universe match the smallness of the Planck length?
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Well, actually, the universe could be considerably larger than that.
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But we will never know.
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Let's go back and look at the dimensions again.
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There are so many big things, so many small things wrapped up in them.
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The universe seems to be exactly the right size, with you in the middle.
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How do you try to get it exactly right, say, when you have to make a big choice, like buying a new mattress?
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You probably compare trustworthy reviews and test out a few models.
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GiveWell is an independent and rigorous resource for a different kind of purchase, a donation.
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GiveWell's mission is to let donors make informed decisions about high-impact giving.
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That's why they've now spent over 15 years researching charitable organizations and only direct funding to a few of the highest-impact opportunities they've found in global health and poverty alleviation, and why we trust their judgment.
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You can find all of their research and recommendations on their site for free.
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Over 100,000 donors have used GiveWell to donate more than $1 billion.
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These donations have the potential to save over 150,000 lives and improve the lives of millions more.
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If you've never donated through GiveWell before, you can have your donation matched up to $100 before the end of the year or as long as matching funds last.
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Donations made through them are tax-deductible, and GiveWell doesn't take a cut.
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To claim your match, go to givewell.org, pick YouTube, and enter Kurzgesagt and check out to get your donation matched.
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We wish you a peaceful and cozy turn of the year.
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See you back at full throttle in January.
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When we think about alien civilizations, we tend to look into the vastness of space, to faraway planets.
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But there is another incredibly vast dimension that we might be giving too little thought to.
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Could it be that over the last hundreds of millions of years, other civilizations existed on Earth?
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What does science have to say about this and what are the implications for us?
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Life on Earth has existed for 4 billion years, mostly as single-celled organisms, until some 540 million years ago, the Cambrian explosion heralded the age of animals.
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Where would we look for them and what could we hope to find?
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Sadly, we have only one civilization to look at, ourselves.
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Anatomically modern humans emerged around 300,000 years ago and probably lived in small groups of hunter-gatherers, slowly spreading around the world.
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Progress was slow and our lifestyle didn't change much, although there may have been local bursts of complexity.
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we changed the face of the planet, cleared forests and constructed cities and temples for our gods at breathtaking speeds and scales.
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Until about 300 years ago, we became an industrial species and yet again our numbers grew exponentially, as did our impact on the planet.
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We could say that our 300,000 year long history has three phases.
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We were hunter-gatherers for 97%, farmers for 2.9% and industrialists for 0.1% of our history.
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And yet, we are super new on Earth.
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On geological timescales, even the sturdiest things lose their durability.
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The oldest large-scale surface is the Negev Desert, a meager 1.8 million years old.
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Everything older has been crushed to dust or turned over and it's either below the ground or covered by ice or ocean.
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Our age, the Anthropocene, will be a layer only a few centimeters thick in a few million years.
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If there were aliens before us and they too went through these three phases, what would remain of them?
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What can we learn about indigenous aliens by looking at ourselves?
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We actually know that in the last few million years there were hunter-gatherer aliens.
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They left fragments of their bodies, of weapons and tools and even art.
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Considering how long they existed and how little remains of them, although they live not that far from our present, it's easy to think there have been others.
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For the last two million years, most hominins lived as hunter-gatherers.
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So if these aliens never moved up higher on the tech tree, hundreds of different species and cultures could have existed without leaving any traces.
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Their artifacts lost to biological and then geological processes.
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At worst, they would leave absolutely nothing to be found after thousands of years.
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We talked about how unlikely the process of fossilization is in more detail in our dinosaur video.
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But in a nutshell, per 100,000 years of Earth's history, we only get a handful of good fossils.
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So we might easily just miss fossils of such people, but even if we had any, we wouldn't necessarily be able to identify them as hunter-gatherers.
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Looking at humans again, agricultural societies left much more to be dug up and found
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because they used more sophisticated tools made from sturdier materials and had to feed millions, leaving many more artifacts.
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Farming allowed them to specialize and develop tech from writing to navigation, architecture, and government.
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Over thousands of years, city-states became kingdoms and empires, some existing for millennia before they fell.
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