What the UV Index Actually Means
by Beth Skwarecki from Lifehacker on (#6C0SP)
We get sunlight every day, but some days the ultraviolet rays are stronger than others. You know this intuitively if you're prone to burning: You probably skip the sunscreen if you're going for a walk in the winter, but slather it on for a midday summer hike. The UV index is a way of putting a number on how strong the...