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The basic unit of length is the nanometer: one-billionth of a meter.
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Nanotechnology is the science of creating and working with materials about one nanometer wide, or one-billionth of a metre.
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Earlier this month India marked the birth of its one-billionth citizen; its population is expected to outnumber China's by 2036.
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ChemCam is Curiosity's coolest bit of science gear, shooting laser beams that deliver a million watts of power for about five one-billionths of a second.