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Like a few have already suggested, the idea of evolution is a very complex story but at the same time a good story.  It is interesting to think that simple organisms have evolved into more complex organisms.  The concept itself is fascinating because it is hard to grasp the idea that we are all different because we are a product of a system that produces with variation but at the same time it makes a great deal of sense!  Also, the idea that humans are only a step in the process of evolution and not the final result is scary but understandable because as history has proven, there are many organisms that have come into existence and then gone extinct.  It is all fascinating but rather mind-boggling at the same time!