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It is always controversial as whether human beings need to improve themselves any further in many respects at present stage if they are not sure whether the new improvement might bring any undesirable consequence. One example is the genetically engineered food which we could only know its effect, good or bad, after trying for generations. Nowadays I believe human greed could create lots of problems. We blame that the natural fruits are too small and with seeds. So they try to do genetic alteration so as to get bigger and seedless fruits. I wonder whether it is safe to take lots of these. It is always mournful to tend to go against nature and forget that man is part of the nature.