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Are these programs alive? It depends upon the definition used for
                                life. What if the programs evolve and develop higher levels of pro-
                                gramming? What happens when these programs are encased in
                                and control mobile robots? How about if the robots learn to build
                                copies of themselves (self-replicate)?
                        Nanorobotics—are we alive yet?
                                A nanobot is a robot the size of a microbe. IBM is making progress
                                in manipulating atoms and molecules to create simple machines
                                and electronics (transistors and wire). So far, there appears to be
                                no restriction on how small one can make an object. Bacteria-sized
                                robots are theoretically possible.

                                Some scientists predict silicon life will be the next evolutionary
                                step, replacing carbon life forms on this planet. What we call elec-
                                tronics and robotics will evolve into self-creating, self-replicating
                                silicon life.

                                Whether or not silicon life becomes the next major evolutionary
                                step on Earth will not be debated here. This chapter will remain
                                focused on the development of artificial intelligence (conscious-
                                ness) and artificial life.
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                        A little history
                                The  progression  of  computer  technology  over  the  last  five  and
                                a half decades is staggering. In 1946 the ENIAC computer filled a
                                large area with electronic equipment. The computer was almost
                                100 feet (ft) long, 8 ft high, 3 ft deep, and weighed 30 tons. ENIAC
                                contained 18,000 tubes, 70,000 resistors, 10,000 capacitors, 6000
                                switches, and 1500 electromagnetic relays. ENIAC could perform
                                5000 additions per second, 357 multiplications per second, and up
                                to 38 divisions per second. Today that same 1946 computer could
                                                                            1
                                be condensed on a tiny sliver of silicon less than    ″ square.
                                                                             4
                                Physicist  Robert  Jastrow  stated  in  The  Enchanted  Loom (New
                                York, Simon & Schuster, 1981) that, “The first generation of comput-
                                ers was a billion times clumsier and less efficient than the human
                                brain. Today, the gap has narrowed a thousand fold.”
                                Science is progressing unrelentingly toward creating AI. Artificial
                                intelligence  is  something  we  may  see  in  our  lifetime.  From  the
                                standpoint of creating competent AI, it’s a small step to generating
                                superior intelligence in machines. That’s a dream, many scientists
                                will tell you, trying to retain the waxing illusion that human intelli-



                                                       Team LRN
            Chapter two
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