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The Cosmetics Design-Europe website reported this week that scientists at the University of Rochester found that sunscreens containing nanoparticles are not as effective at protecting people with sun-damaged skin. Tests done on lab mice using quantum dot nanoparticles (to simulate the titanium dioxide nanoparticles found in sunscreens) showed that the particles "penetrated UV damaged skin more than non-compromised skin."

This is particularly important as people put sunscreen on burned skin therefore really needing more protection and may actually be getting less. The scientists a...