We could do it without side-effects - but it will take a lot of fine tuning. For example, we could make our fingers longer and more slender if we wanted to, but we would probably have more chance of getting arthritis. We would then need to do a lot more research and experimenting to stop arthritis coming up - but it would take a while.
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The average human these days is arrogant and power-mad deep down and if they had such advances they would try anything to get what they want.
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I don't agree with this statement in the slightest.