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Teeny little gears
Scientists at the US Department of Energy's Sandia National Laboratories in Texas have built a nanogear bicycle chain so small that the center-to-center distance of each link is the width of a human hair. Each of the layers you see in the photo above is one atom high The microchains can rotate microscopic drive shafts just like the gears on a bike. The designers say it could be used to power the shutters of tiny cameras, timing devices, and microchip power sources
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