Science

WELL Lawsuits Over Baby Powder Raise Questions About Cancer Risk By RONI CARYN RABIN Thousands of women claim talcum powder caused their ovarian cancer, but research into a potential link has produced mixed results. THE NEW OLD AGE Older Men Are Still Being Overtested for Prostate Cancer By PAULA SPAN Eight years after an expert task force recommended against routine use of PSA screening for men over 75, testing levels have fallen only slightly. New Solar Plants Generate Floating Green Power By ERICA GOODE So-called floatovoltaics are attracting international interest as a space-saving, high-efficiency alternative to land-based solar power plants. For more science news, go to NYTimes.com/Science »