That's not entirely surprising, because few people put it on right. First, of course, you've got to buy the good stuff. Check labels for a high SPF, whic protects you against burning UVB rays and delivers top protection against ageing and deep damaging UVA rays.

Next, you have to use a lot-roughly two finger-length squirts of sunscreen on every major body area (arms, upper legs, lower legs). And use it often. Don't expect it to be effective for more than 2 hours. Make that 40 minutes if you're swimming or sweating.

Before you step out every morning, slather on some sunscreen, especially on your right side, because the sun is sneaky and almost bends around corners to get you. People abroad who develop skin cancer on the left side of their bodies tend to spend more time behind the wheel. The link: Window glass doesn't block harmful rays (although tinted windows limit UVA a bit). People who drive with the windows open, get more left-side skin cancers. So turn on the AC (who knew it prevented cancer)!