Is sun-tanning good for you, after all?

Finally, some good news for sun worshipers who have withstood years of warnings about the dangers of skin cancer. Researchers in Scotland have just released a study suggesting that the benefits of exposure to sunlight might outweigh the dangers. The news comes as the Food and Drug Administration proposes tighter regulations for tanning beds, with public health officials saying UV-based sun lamps can boost your risk of melanoma by 75 percent. How can a force with such potential for harm actually be good for you? Here's what you need to know:

How was the experiment conducted?
Dermatologists at the University of Edinburgh put 24 volunteers — all in their early 20s — under tanning lamps.