Maybe in the future we will each have an avatar that lives in a virtual reality and controlled by neural signals from the brain. Your body will be a sleeping vegetable while you (your avatar) are alive and kicking in the alternative world. It is like being in a dream, but this one can be controlled/custom-made. You will only need your brain to stay alive in this perfect reality so most your body parts will eventually die in one way or another, although you will be perfectly healthy in the alternative world. Or is that the real world and this one we're currently living is the alternative?

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