In a 1959 lecture at the California Institute of Technology, the physicist Richard Feynman considered a future in which molecular machines could “arrange the atoms the way we want,” creating a vast array of possibilities. Such machines might, for instance, allow us to “swallow the surgeon,” he said—we could ingest tiny machines that swim through our bodies to repair faulty heart valves or failing organs. Feynman’s talk established the conceptual foundations for manipulating matter at the nanosca

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