Originally published in the New York Sun.
The poet William Blake imagined what it would be like “to see the world in a grain of sand.” Reading “Microcosm” (Pantheon, 243 pages, $25.95), Carl Zimmer’s new book on the world’s most famous bacterium, one wonders whether Blake might have phrased his reverie differently if he had had an electron microscope. Had Blake looked closely enough, at a magnification that would make sand grains look like lifeless, barren mountains, the poet would have seen a remarkably complex creature, one so beguiling that it is, as Mr. Zimmer’s title suggests, easy to imagine it as a world in miniature. The bacterium, whose genome scientists mapped fully by 1997, fights viruses, just as we do; it fights its enemies, just as we do; it even has a primitive kind of sex. It is, the author argues persuasively, a model organism, and one with much to teach our own species.