13 Things That Don't Make Sense: The Most Intriguing Scientific Mysteries of Our Time | 
We are pouring huge amounts of energy into the biological effort to understand where life came from, how it arose on planet Earth, because it matters to us; it is, perhaps our deepest question. Really, it boils down to this: Are we special? The best summation has been attributed to the writer Arthur C. Clarke: "Sometimes I think we're alone in the universe, and sometimes I think we're not," he said. "In either case the idea is quite staggering."
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