[SIZE=3]Was thinking again about this...there is no law of of physics against the ability to produce synthetic body parts to replace all functioning parts, except perhaps the human brain..and there is debate on that. The known laws of chemistry and physics also show it is possible to build self-replicating machines such as a personal replicator foundry that can assemble any chemically-stable structure you want, from atoms and molecular parts. Knives, clothes, computers, chairs, tables, you name it. Ultimately, and while it would be harder to do..even food could be produced this way.
The same machines can produce steel strong paper thin dirt cheap solar cells and fuel cells..so energy no longer becomes a problem.
Take those three technologies, and add them to the human race as is. What happens? How will people react and integrate these things into their lives?