"It is as hard to see one's self as to look backwards without turning around," wrote Thoreau -- an odd quote from someone who's known for living alone in the woods. "Know thyself"? As it turns out, it's harder than it sounds.
If nature is red in tooth and claw, then "survival of the fittest" sounds like a fight to the death. Natural selection is what drives evolution. Is it true that only the strong survive?