Regulating nanotechnology in South Africa
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A nanometre (nm) is one thousand millionth of a metre. To put this into context a simple human hair is about 80,000nm wide. A red blood cell is approximately 7,000nm wide, while a water molecule is almost 0.3nm across. Scientists researching on the nanoscale (which they consider to range from 100nm down to the size of atoms which are less than 0.2nm) do so to investigate the properties of materials which they have discovered can be very different at that scale than they are at a larger scale.
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