What makes us human?
Scientists figured out decades ago that chimps are our nearest evolutionary cousins, roughly 98 percent to 99 percent identical to humans at the genetic level. When it comes to DNA, a human is closer to a chimp than a mouse is to a rat.
Yet tiny differences, sprinkled throughout the genome, have made all the difference.
Agriculture, language, art, music, technology and philosophy -- all the achievements that make us profoundly different from chimpanzees -- are somehow encoded within minute fractions of our genetic code.
[Genetic engineering by aliens?]
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