World’s Smallest Rotary Engine Highlighted May 25, 2009 — The smallest rotary motor in the world keeps your body humming. It also keeps bacteria, plants, polar bears, giraffes, salmon, sea urchins and just about everything else humming. It’s a nano-wonder called ATP synthase. This molecular motor has been reported many times in these pages, but not recently; what’s new? The state of our knowledge about ATP synthase was summarized in a paper in Nature by three German scientists.[1] Basically, it’s a fascinating machine, but there’s still a lot more to learn. It’s not just figurative speech to call...