I'd been wondering why my sunblock didn't seem to work as well as it used to. This site did product comparisons on sunscreens and most of them don't work well.
Cosmetic Safety Database - Sunscreens: "Does your sunscreen work? An investigation of nearly 1,000 brand-name sunscreen products finds that 4 out of 5 contain chemicals that may pose health hazards or don't adequately protect skin from the sun's damaging rays. Some of the worst offenders are leading brands..."
