Early signs of puberty evident . Plastics possible culprits in early puberty . Common chemicals cited in early puberty . Ever-younger puberty puzzles researchers . Early onset of puberty worries some experts.
Plastic debris picks up ocean toxics .
Contaminants still lace some meats . Scientists learning to keep tabs on dioxin . Dioxin named a known carcinogen . Diesel gases masculinize fetal rodents. Pregnant women warned about mercury in fish.