“Disease and ill health are caused largely by damage at the molecular and cellular level, yet today's surgical tools are too large to deal with that kind of problem.”
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Lighter computers and lighter sensors would let you have more function in a given weight, which is very important if you are launching things into space, and you have to pay by the pound to put things there.
If you look at the various strategies available for dealing with a new technology, sticking your head in the sand is not the most plausible strategy.
Many people in the world today are not starving because there is an inherent inability to produce food, they are starving because they are caught in the middle of political fights and blockades that have been used as weapons.
If you look at the human condition today, not everyone is well fed, has access to good medical care, or the physical basics that provide for a healthy and a happy life.