UCLA researchers believe they have a solution.

The chalky white cast that some sunscreens lend to skin is one of the reasons people tend to shy away from them. After all, when you're trying to show off that hard-won summer tan, the last thing you want is something that'll make you look like you spent the whole summer in your mom's basement. Yet, using sunscreens is one of the best ways to ward off the leading cause of preventable skin cancer.

So, if a sunscreen could be developed that kept its protective ability without making people look slightly vampiric, more people might use it. That's at least part of the thinking that led researchers at UCLA to come up with a solution.