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"Splashing" plays a central role in the transport of pollutants and the spread of diseases, but while the sight of a droplet striking and splashing off of a solid surface is a common experience, the actual physical ingredients and mechanisms involved in splashing aren't all that well understood.

You may be vigilant with the sunscreen, but here's the bad news: UV radiation alters the actual DNA of your skin cells, causing lines, wrinkles, discoloration, and even cancer. Here's a ray of (UV-free) light: You can reverse sun damage.