December 13: Nanotechnology

‘Some nanotechnology products are applied directly to the skin, such as cosmetics and sunscreens. Titanium dioxide is commonly used as the white pigment in sunscreen. When it is ground into nanoparticles it can still block harmful ultraviolet radiation, but it allows visible light to pass straight through, which means modern sunscreens can appear completely transparent, while offering the same protection as the old white stuff.’