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The third crucial mutation is in your cell's suicide switch.
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Most cells are constantly recycled and refreshed.
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When cells amass too much damage, they usually notice, and special genes trigger a controlled suicide called apoptosis.
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If the genes that control this process get damaged, cells are free to live on, despite being dangerously corrupted.
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and begins to grow rapidly without restraint, it turns into a young cancer cell.
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These cells have to be killed as quickly as possible.
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While they are bad at this stage, they are still pretty weak and easy to kill.
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But if they continue to mutate and increase in number, they can learn to avoid your defenses and become a real threat.
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At any moment of your life, your immune system is hunting these cells.
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But how do you identify and kill corrupted cells that seem indistinguishable from healthy ones?
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Well, here we come back to the proteins your cells produce and the story they tell.
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So, if for example your oncogenes switch back on, they make oncogene proteins.
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Your immune system knows that they should not be present if you're an adult.
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So to know which cells are corrupt and which are healthy, your immune system needs to know what proteins they're making inside.
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To solve this, evolution came up with MHC class 1 molecules, a sort of display window that makes cells transparent.
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Cells constantly take little samples of the proteins they make and put them into thousands of these MHC molecules to showcase what they're doing.
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The selection is constantly refreshed, always giving an up-to-date picture.
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There's a whole library of proteins that are highly dangerous and should not be made by healthy cells, and your immune system has them all on file.
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It has billions of specialized cells called T-cells made to recognize specific proteins.
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If a T-cell sees a forbidden protein in an MHC display window, it knows that the cell is corrupted and kills it immediately.
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But there's a flaw in this system.
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All it needs to do is to stop making MHC class 1 molecules and boom, it's invisible.
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Without display windows, the immune system is blind and can't identify cancer anymore.
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Fortunately, evolution found an ingenious solution.
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At this very second, hundreds of millions of natural killer cells are patrolling your body looking for cells that have already turned into cancer or are corrupted by a virus.
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Natural killer cells go from cell to cell to check for one thing.
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Does a cell have MHC class 1 molecules?
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Does it have a display window and is it doing its duty of showing off what's going on inside itself?
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This is so amazing because it covers all of your bases.
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While T-cells look for the presence of the unexpected, something that should not be here, natural killer cells look for the absence of the expected, the absence of something that should be here.
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The logic is, if a cell does not have display windows, it wants to hide something.
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And a cell that hides something must be killed.
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What makes the natural killer cell even more metal is that it's always in murder mode.
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It patrols your body checking cell after cell with the intention of killing it.
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Your healthy cells have to convince it that they should not die today.
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And a way to do that is to have MHC class 1 molecules.
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So, in summary, almost all young cancer cells you will ever develop in your life will be killed by your immune system.
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Okay, but if your body is this prepared, why do we still get cancer?
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Well, sometimes cancer cells mutate more and get much better at fighting back.
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Cancer is a story of an arms race.
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Right now, a number of therapies are beginning to show amazing promise, from cancer-fighting vaccines to engineered T-cells and even natural killer cells.
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We'll look at these therapies in future videos.
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So, the war is not won yet, but we are on to cancer and eventually it will be eliminated once and for all.
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This video was made possible in part by direct viewer support and in part through a grant by Gates Ventures.
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Please check out our source document for more background and in-depth information.
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From hostile deserts to lonely islands and the highest mountains, wherever there is space to expand into, humans do so.
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So it's hardly surprising that we're already making preparations to set foot on Mars and to create the first permanent colony outside of Earth,
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maybe even terraform another planet and turn it into a second blue home.
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Before we can get to the nice future stuff, we first have to complete the second phase of colonization, creating a semi-permanent outpost to prepare the ground for a larger human presence.
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But doing so will be gruesome.
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Even for an expansionist species like us, Mars is extreme.
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At first glance, Mars seems familiar.
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Unfortunately, Mars is actually a cold, radioactive desert where the ground is poisonous and breathing is impossible.
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Mars is awful.
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You almost certainly don't want to go there.
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The pioneers doing the hard work on Mars will have an intensely stressful life filled with incredibly challenging problems, never encountered before.
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But there are plenty of people willing to do that work and we have the technology to enable them to do it.
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For this video, we will assume there have been prior missions to Mars to scout out a good place for an outpost, store resources and equipment and that there's already a moon base that serves as a hub for Mars missions.
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The first major challenge for our outpost is the fact that Mars is very energy poor.
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Because of its distance from the Sun, solar power is only 40% as effective as on Earth.
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But even this weakened sunlight is often obscured for days by enormous dust storms.
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Solar power alone will probably not be enough.
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Alternatives such as wind power and geothermal energy are also unfeasible as there's hardly any atmosphere and Mars's interior is much too cold.
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Initially, nuclear technology might be the only option.
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Since Mars doesn't have easily accessible radioactive elements, the nuclear fuel needs to come from Earth along with the reactor.
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If we do set it up, it could power our small outpost for the first few years.
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Unfortunately, all that energy won't be very useful if we can't breathe.
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Mars's atmosphere is only 1% as dense as Earth's and mostly made up of CO2.
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So our habitats need to be pressurized and filled with an artificial atmosphere made of nitrogen and oxygen, which comes with more problems.
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Corners and flat walls are weak points, so the habitats will have rounded and smooth shapes to handle the stress of great pressure differences between the interior and exterior.
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The airlocks need to be very airtight and work perfectly every time.
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Without an extensive magnetosphere or a dense atmosphere, half of all radiation coming from space reaches the ground.
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A person on the surface would be subjected to 50 times the radiation that they would be on Earth.
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Three years on the surface of Mars exceeds the radiation dose limits imposed on NASA astronauts for their entire career.
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This increases cancer risks significantly.
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To prevent that, we could shield our habitats with a thick layer of frozen CO2 that can be harvested directly from the atmosphere.
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Covering the dry ice with a meter of dirt would further increase the level of protection.
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Sadly, this means almost no windows.
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From the inside, most living spaces will be windowless tunnels.
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From the outside, they'll look like burial mounds.
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All of this would still not hold back all the radiation, but reduce it just enough to be survivable for long periods of time.
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It won't, however, protect anyone who ventures outside.
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So, remote-controlled robots will be used for routine work on the surface while our crew stays inside.
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Staying inside is a good idea for another reason.
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It's much finer than dust on Earth, so it could find its way into the gears or electronics of our machines.
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Because it's also very dry, it's electrostatically charged, sticking to everything, like spacesuits.
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It would be impossible to avoid carrying lots of Mars dust into our habitat and into the lungs of our crew.
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To make this even worse, Mars' soil is filled with very toxic perchlorate salts.
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Constant exposure could be deadly.
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This problem can still be overcome, though.
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Spacesuits, for example, could be made in a way that they never truly enter the base, but stay attached to the outside of the habitats.
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Now we've safely isolated humans in terms of energy and air, and protected them from cancer, we just need to feed them.
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Water is easy to come by if a settlement is positioned near the Martian poles with their thick layers of ice.
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Growing food is a different kind of challenge, though.
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Mars' soils are alkaline and lack the vital nitrogen compounds that plants need to grow.
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Before we can grow anything, we will have to decontaminate the soil, which is difficult and expensive.
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Then the soil can be fertilized using recycled biological waste.
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All of this will take a lot of time and is very energy intensive.
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So we might use aquaponics to raise fish and plants together, making the astronauts' diets more varied and tasty at the same time.
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This will be an important psychological boost for our overworked crew.
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