On the other hand, artificial life is not real life, because it can only live in man-made environment. Artificial life dies once the electricity is cut down. Artificial life may be treated as real life with the premise of neglecting this condition. The research of artificial life only has value in theory, no value in practice has been found.

The second kind of artificial life is produced by scientists using biological technology, which is said to have become true (Gibson et al., 2010). But it, in fact, belongs to the product of genetic engineering, because not all materials of it are non-living things. Even it was possible for scientists to produce life with non-living materials completely, it is doubtful whether it would have more practical value than genetic engineering.

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