Imagine a swarm of molecule-sized machines that travel through your bloodstream to attack a tumor or destroy fat deposits. A microwave oven-sized device that can turn a handful of grass into a prime cut of beef. Fleets of molecular assemblers that churn out essential commodities without human labor. It may sound like science fiction, but according to acclaimed science writer Ed Regis, nanotechnology -- the science that could someday allow us to construct any substance we wish by arranging individual atoms & molecules one at a time, as if they were building blocks -- may soon be a reality. "Crisp science journalism.".