Two other kinds of artificial lives have real practical value, including nanometer robot and artificial intel- lectual robot. Nanometer robot is going to become life in natural environment without any premise, if it is able to reproduce itself. Nanometer robot is being studied in many countries with enormous investment. It will play positive role in many fields including engineering and medicine. At the same time, nanometer robot may bring huge disaster to human being. Nanometer robot may reproduce itself continuously without finish. They can even change all materials on the Earth including people and all products of people into nanometer robot. This is degeneration instead of evolution, and is the real disaster of the Earth.

By comparison, artificial intelligence is completely different with nanometer robot. Artificial intellectual robots will become real life once they are able to reproduce themselves. The development of artificial intelligence is evolution, even if they would massacre all human being just as many people worried (Garis, 2009). We do not need to worry about that, because artificial intelligence is able to learn the law that do not impose on others what you yourself do not desire. Man has faced various disasters. The risk of artificial intelligence is worthy to take, we should treat them as our children. Only artificial intelligence is able to eliminate all other disasters of people in the future.

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