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Clones, Supercomputers and Robots

As "nanotechnologists" strive to build self-replicating atomic-size machines, there are already numerous -- oft disturbing -- examples of the merging of technology and nature. One of these is a machine that gets it power by feeding on snails and other living creatures. Does the possiblity of a world in which humankind no longer controls the super-intelligent machines we've created and where nature is eclipsed by artificial evolution necessitate a plan for a "Green" Singularity?