While wearing sunscreen is essential and a good SPF is important, it is important to note that a sunscreen should have more than just a SPF. Our sun puts out two types of harmful radiation. The first, ultraviolet A radiation (UVA) is responsible for premature skin aging, while the other, ultraviolet B radiation (UVB), causes sunburns. However, both types of radiation have been linked to causing skin cancer.

While most sunscreens provide protection against both types, the S.P.F. rating relates only to UVB exposure.

Your sunscreen should also block UVA radiation. Two ingredients now used in "complete" sunscreens are titanium dioxide and zinc oxide.

These products are cosmetically safe, and it is important to ensure that your sunscreen has both.

By practicing some of these tips, you can make sure that you enjoy all the benefits of the sun, while keeping your skin healthy for many years. Enjoy your summer, but remember to slather up before you head out; your skin will definitely thank you for it.

Doctors have some novel things to blame for weight gain

Milwaukee (US), June 27 (AP): Why are so many people fat? Scientists have come up with some novel excuses, including air conditioning, lack of sleep, fewer smokers, and more sex among obese people, which can produce chubby kids.

Desserts are not the only things weighing America down, these researchers contend in a report published today in the International Journal of Obesity.

"I think it's very creative," said Dr Robert Kushner, medical director of the weight management programme at Northwestern Memorial Hospital in Chicago , who had no role in the report. "We are facing an epidemic with no tipping point in the near future. At this point, there are no silly ideas."

However, some critics say the authors' "Top Ten" list of alternative explanations reads more like material for a late night talk show routine than a scientific study.

"I'd put this in the category of 'calorie distracters' - 'Let's just do anything to get people to stop worrying about having to eat less and move more,'" said Marion Nestle, a nutrition professor at New York University and frequent food industry critic. "'And let's not say a word to food companies about misleading and manipulative marketing practices, especially those directed toward children.'"

David Allison, a University of Alabama biostatistician, invited 19 other scientists in the United States , Canada and Italy , to work on the report.

They looked at more than 100 studies on potential contributors to obesity besides diet and exercise, and concluded there was at least some support for 10.

Inadequate sleep. (Average sleep amounts have fallen, and many studies tie sleep deprivation to weight gain.)