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Tritium could bond with oxygen, making radioactive water, which could be dangerous as it seeps into the environment.
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Fortunately, there's no more than a few grams of tritium in use at a given time, so a leak would be quickly diluted.
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So we've just told you that there's nearly unlimited energy to be had, at no expense to the environment, in something as simple as water.
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So, what's the catch?
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We simply don't know if fusion power will ever be commercially viable.
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Even if they work, they might be too expensive to ever build.
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The main drawback is that it's unproven technology.
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It's a 10 billion dollar gamble, and that money might be better spent on other clean energy that's already proven itself.
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Maybe we should cut our losses.
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Or maybe, when the payoff is unlimited clean energy for everyone, it might be worth the risk.
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Videos like this one take hundreds of hours to make, and are made possible by your contributions on patreon.com.
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If you want to learn more about global energy, here's a playlist about nuclear energy, fracking, and solar power.
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Let us know in the comments if there are other technologies you want us to explain.
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Imagine you were alive back in the 1980s and were told that computers would soon take over everything, from shopping to dating and the stock market.
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That billions of people would be connected via a kind of web.
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That you would own a handheld device orders of magnitude more powerful than supercomputers.
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It would seem absurd, but then all of it happened.
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Science fiction became our reality and we don't even think about it.
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We're at a similar point today with genetic engineering.
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So let's talk about it.
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Humans have been engineering life for thousands of years.
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Through selective breeding, we strengthened useful traits in plants and animals.
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We became very good at this, but never truly understood how it works.
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Until we discovered the Code of Life, Deoxyribonucleic Acid, DNA.
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Information is encoded in the structure of the molecule.
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Four nucleotides are paired and make up a code that carries instructions.
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Change the instructions and you change the being carrying it.
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As soon as DNA was discovered, people tried to tinker with it.
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In the 1960s, scientists bombarded plants with radiation to cause random mutations in the genetic code.
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The idea was to get a useful plant variation by pure chance.
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Sometimes it actually worked too.
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In the 70s, scientists inserted DNA snippets into bacteria, plants and animals to study and modify them.
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The earliest genetically modified animal was born in 1974.
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In the 80s, we got commercial.
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The first patent was given for a microbe engineered to absorb oil.
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Today, we produce many chemicals by means of engineered life.
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The first food modified in the lab went on sale in 1994.
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But GM food and the controversy surrounding them deserve a video of their own.
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In the 1990s, there was also a brief foray into human engineering.
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To treat maternal infertility, babies were made that carried genetic information from three humans.
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Today, there are super muscled pigs, fast growing salmon, featherless chickens and see-through frogs.
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On the fun side, we made things glow in the dark.
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Fluorescent zebrafish are available for as little as $10.
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All of this is already very impressive.
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But until recently, gene editing was extremely expensive, complicated and took a long time to do.
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This has now changed with a revolutionary new technology now entering the stage.
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Overnight, the costs of engineering have shrunk by 99%.
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Instead of a year, it takes a few weeks to conduct experiments and basically everybody with a lab can do it.
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It's hard to get across how big a technical revolution CRISPR is.
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It literally has the potential to change humanity forever.
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Why did this sudden revolution happen and how does it work?
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Bacteria and viruses have been fighting since the dawn of life.
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So-called bacteriophages or phages hunt bacteria.
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In the ocean, phages kill 40% of them every single day.
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Phages do this by inserting their own genetic code into the bacteria and taking them over to use them as factories.
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The bacteria try to resist but fail most of the time because their protection tools are too weak.
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But sometimes, bacteria survive an attack.
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Only if they do so can they activate their most effective antivirus system.
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They save a part of the virus DNA in their own genetic code in a DNA archive called CRISPR.
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Here, it's stored safely until it's needed.
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When the virus attacks again, the bacterium quickly makes an RNA copy from the DNA archive and arms a secret weapon, a protein called Cas9.
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The protein now scans the bacterium's insides for signs of the virus invader by comparing every bit of DNA it finds to the sample from the archive.
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When it finds a 100% perfect match, it's activated and cuts out the virus DNA, making it useless, protecting the bacterium against the attack.
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What's special is that Cas9 is very precise, almost like a DNA surgeon.
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The revolution began when scientists figured out that the CRISPR system is programmable.
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You can just give it a copy of DNA you want to modify and put the system into a living cell.
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If the old techniques of genetic manipulation were like a map, CRISPR is like a GPS system.
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Aside from being precise, cheap and easy, CRISPR offers the ability to edit live cells, to switch genes on and off and target and study particular DNA sequences.
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It also works for every type of cell, microorganisms, plants, animals or humans.
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But despite the revolution CRISPR is for science, it's still just a first-generation tool.
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More precise tools are already being created and used as we speak.
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In 2015, scientists used CRISPR to cut the HIV virus out of living cells from patients in the lab, proving that it was possible.
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Only about a year later, they carried out a larger scale project with rats that had the HIV virus in basically all of their body cells.
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By simply injecting CRISPR into the rats' tails, they were able to remove more than 50% of the virus from cells all over the body.
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In a few decades, a CRISPR therapy might cure HIV.
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And other retroviruses, viruses that hide inside human DNA like herpes, could be eradicated this way.
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CRISPR could also defeat one of our worst enemies, cancer.
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Cancer occurs when cells refuse to die and keep multiplying while concealing themselves from the immune system.
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CRISPR gives us the means to edit your immune cells and make them better cancer hunters.
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Getting rid of cancer might eventually mean getting just a couple of injections of a few thousand of your own cells that have been engineered in the lab to heal you for good.
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The first clinical trial for a CRISPR cancer treatment on human patients was approved in early 2016 in the US.
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Not even a month later, Chinese scientists announced that they would treat lung cancer patients with immune cells modified with CRISPR in August 2016.
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Things are picking up pace quickly.
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And then there are genetic diseases.
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There are thousands of them and they range from mildly annoying to deadly or entail decades of suffering.
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With a powerful tool like CRISPR, we may be able to end this.
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Over 3,000 genetic diseases are caused by a single incorrect letter in your DNA.
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We are already building a modified version of Cas9 that is made to change just a single letter, fixing the disease in the cell.
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In a decade or two, we could possibly cure thousands of diseases forever.
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But all of these medical applications have one thing in common.
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They are limited to the individual and die with them, except if you use them on reproductive cells or very early embryos.
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The means to edit the genome of a human embryo already exists, though the technology is still in its early stages.
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But it has already been attempted twice.
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In 2015 and 2016, Chinese scientists experimented with human embryos and were partially successful on their second attempt.
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They showed the enormous challenges we still face in gene editing embryos, but also that scientists are working on solving them.
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This is like the computer in the 70s.
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There will be better computers.
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Regardless of your personal take on genetic engineering, it will affect you.
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Modified humans could alter the genome of our entire species because their engineered traits will be passed on to their children
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It will start slowly.
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