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How many years away are we from using cryogenics?
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Believe it or not, companies have already been using cryogenics for the purpose of life extension!

I actually met Dr. Max More, CEO of the Alcor Life Extension Foundation, in 2015 at the Biohacker Summit in Helsinki, Finland. Alcor is a company that is using cryogenic preservation now and you can sign up to have them care for your body after "death."

Here's some video I took of him speaking to this very issue during the conference: https://www.youtube.com/watch?v=KLlyhS_3Qws&t=

Now whether or not this actually works is another question. I think, in order to believe in cryogenics preserving life, you need to philosophically be a Materialist. That is, believe that consciousness is a product of the brain and nothing else. I suppose if/when this question is answered, we'll all be long gone... but maybe some will be revived! 

I'm not a Materialist myself and I think it's certainly possible that the brain creates consciousness, there's no evidence for it. Correlation does not equal causation, the brain could merely be the conduit through which  consciousness is able to express itself. Dr. Stanislav Grof likens this to watching a television show. Say you're watching LOST (love it or hate it!) Your television set does not create the show, it's just used to tune into the broadcast coming from elsewhere.

So, the question creates even more questions to ponder!

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Some. I'm not sure there's a better answer to be had, as there are still significant technical leaps necessary to get to the point of successfully freezing a human and restoring them afterward. The idea is an interesting fantasy, but technically very difficult, because humans are made largely of water, and it's water that's stored in materials that have different freezing points, which is very important to the post-freezing composition. Think of the difference between freezing fruit juice, which can generally be returned to what it was by thawing, and freezing a whole fruit, which changes its physical composition drastically. This may be a solvable problem but it's not a solution we're close to.

In terms of life-extension technology, we're likely much closer to being able to copy a human brain-pattern into digital form than we are to achieving functional cryogenics. And the one will probably make development of the other seem not very urgent.

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Right now you can make plans to have your body frozen after death by organizations such as Alcor Life Extension Foundation and have a life insurance policy pay for the cryogenic process of freezing your body but we don't know how to revive you later. It might not be feasible to truly use cryogenics until we can repair the damage freezing does to human cells. Successful cryogenics may require other technologies such as cloning and nanobots.

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