"And now comes nanophobia, the fear that tiny components engineered on the nanoscale - that is, 100 nanometers or less - could run amok inside the body. A human hair, for example, is 50,000 to 100,000 nanometers in diameter. A nanoparticle of titanium dioxide in a sunscreen could be as small as 15 nanometers. (One nanometer equals a billionth of a
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