Where did you go to university? http://streamate.in.net/ streammate.com  The sun can change your hair color, but products with UV filters or antioxidants may keep your hue from fading or turning brassy. If you like the color you've got (or spent good money to get it), a spray like Paul Mitchell Sun Shield Conditioning Spray ($18; paulmitchell.com for salons), shown above, helps. Will it prevent cancer? No—and cancer commonly forms on the scalp, says Dr. Katz. You should still wear a hat or use traditional SPF on your part (or your entire scalp if your hair is thin).