Tiny particles: Big potential or big threat?
CHICAGO (MCT) — Zinc oxide would be the perfect sunscreen ingredient if the resulting product didn’t look quite so silly. Thick, white and pasty, it was once seen mostly on lifeguards, surfers and others who needed serious sun protection.
But when the sunscreens are made with nanoparticles, the tiniest substances that humans can engineer, they turn clear — which makes them more user-friendly.
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