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For the fifth time, we present to you the Human Era Calendar for the year 12,021 – this time it is all about the journey of humanity, beginning tens of thousands of years ago, leading into the revolution of agriculture, to ancient high civilizations and the beginning of modern times, culminating in a vision for our future. You can get the limited Edition now until we sell out and then never again. As always the calendar features 12 illustrated pages printed on high quality paper in Europe and the US. And this year the cover is especially shiny. The calendar will look great on your wall and let you dream about a glorious future. We truly have come far as a species! 

Sources & further reading: https://sites.google.com/view/sourceswhentimebecamehistory

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The observable universe is a big place that has been around for more than 13 billion years. Up to two trillion galaxies made up of something like 20,000 billion billion stars surround our home galaxy. In the milky way alone scientists assume there are some 40 billion earth like planets in the habitable zone of their stars. When we look at these numbers it is hard to imagine that there is nobody else out there.

Sources & further reading: https://sites.google.com/view/sourceskardashevscale/

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What is outside of the universe? We know that the universe had a beginning 14 billion years ago and that it has been expanding ever since.

But something that is expanding should also have an edge, right?

What would you see if you went there?

Sources & further reading: https://sites.google.com/view/sources-infinite-universe

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We have a bunch of new stuff, from the long requested bacteriophage infographic poster to a new Optimistic Nihilism poster that lets you enjoy some existential dread in style. Or join us in our ant obsession and get the new Ant Explorer Notebook, with beautiful infographics and facts about ants and gold lettering on the cover. If you’d rather update your wardrobe, have a look at our beanies or T Shirts. Or you know, all the other stuff!

We put a lot of love and care into developing our products and only make stuff we want to have ourselves – if you want to support kurzgesagt, getting some merch is the best way to do it while receiving something beautiful in return. Thank you for your support and thank you for watching.

Sources & further reading: https://sites.google.com/view/sourcessolarflares

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In the 1970s thousands of Chickenheads rained from the sky in Europe, making foxes and other wildlife confused and very happy. Why? They were filled with a vaccine to fight the deadliest virus known to humanity – since the 1930s a rabies epidemic had been sweeping across wildlife populations in Europe and humans wanted to finally get rid of the virus once and for all.

Rabies is named after Lyssa, the ancient Greek spirit of mad rage, and has been haunting us for at least 4000 years. It can turn animals into angry beasts and humans into zombies that fear water. But what makes Lyssa fascinating is not just how bizarre and deadly its infection is, but also how incredibly good it is at avoiding our defenses.

Sources & further reading: https://sites.google.com/view/sources-rabies/

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Black hole stars may have been the largest stars to ever exist. They burned brighter than galaxies and were Larger than any star today or that could ever exist in the future. But besides their scale, what makes them special and weird is that deep inside, they were occupied by a cosmic parasite, an endlessly hungry black hole. How is that even possible?

Sources & further reading:

https://sites.google.com/view/sources...

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The human immune system is the most complex biological system we know, after the human brain, and yet, most of us never learn how it works. Or what it is. Your immune System consists of hundreds of tiny and two large organs, it has its own transport network spread throughout your body. Every day it makes hundreds of billions of fresh cells.

It is not some sort of abstract entity. Your immune system is YOU. Your biology protecting you from the billions of microorganisms that want to consume you and from your own perverted cells that turn into cancer. It's so manifold that it is impossible to cover in one video, so we’ll make a series looking at different aspects of it.

Today, what happens when your body is invaded and your first lines of defenses are engaged in a fight for life and death?

Sources & further reading: https://sites.google.com/view/sources-immunesystemexplained

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Few of the monsters that evolution created have been so successful at hurting us as the variola virus, responsible for smallpox. The carnage it caused was so terrible and merciless that it compelled humankind, for the first time, to act truly globally. It was one of the greatest wins of our species over the ancient powers of nature, all made possible by… cows.

Sources & further reading: https://sites.google.com/view/sources-smallpox

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At its height, the Roman Empire was home to about 30 % of the world’s population, and in many ways the pinnacle of human advancement. Rome became the first city in history to reach one million inhabitants and was a center of technological, legal, and economic progress. An empire impossible to topple, stable and rich and powerful.

Until it wasn’t anymore. First slowly then suddenly, the most powerful civilization on earth collapsed. If this is how it has been over the ages, what about us today? Will we lose our industrial technology, and with that our greatest achievements, from one dollar pizza to smartphones or laser eye surgery? Will all this go away too?

Sources & further reading: https://sites.google.com/view/sources-civilization-collapse/

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Sources & further reading: https://sites.google.com/view/sources-middle-of-scale/ You are in the middle of everything in the Universe. Let us go on a fantastical journey together - to the impossibly small and the incomprehensibly large!

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