Think about it...: Humankind is successful as a species because its members are all different. There is somebody to perform each of thousands of different tasks, and the diversity is kept going because people who are similar tend to marry. With 30000 different brain proteins making us who we are, and varying environments on top of all this, it's no wonder we're variable in every way. Enjoy the variety.
Answered 3/7/2013
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