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We humans like to think of ourselves as highly evolved creatures. But if we are supposedly evolution's greatest creation, why do we have such bad knees? Why do we catch head colds so often - 200 times more often than a dog does? How come our wrists have so many useless bones? And are we really supposed to swallow and breathe through the same narrow tube? Surely there's been some kind of mistake. As professor of biology Nathan H. Lents explains in Human Errors, our evolutionary history is nothing if not a litany of mistakes, each more entertaining and enlightening than the last.

We like to think of ourselves as highly evolved creatures. But if we are evolution's greatest creation, why are we so badly designed? We have retinas that face backward, the stump of a tail, and way too many bones in our wrists. We must find vitamins and nutrients in our diets that other animals simply make for themselves. Millions of us can't reproduce successfully without help from modern science. We have nerves that take bizarre paths, muscles that attach to nothing, and lymph nodes that do more harm than good. And that's just the beginning of the story.