Sunscreens shield human skin with chemicals that either absorb or deflect damaging ultraviolet rays, most often titanium dioxide or the zinc oxide known best as the white stuff lifeguards slather on their noses. But it seems they (and others) don't have to put up with the white mess: Zinc oxide can be made clear--and remain just as, if not more, effective as a sunblock--by shrinking it into tiny particles between one and 100 nanometers. (A nanometer equals one billionth of a meter, or 3.94 x 10-8 inches--roughly half the size of a strand of DNA.)
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