Dead Daphnia flag mystery water contaminants | News Briefs: Water, a shared responsibility ` Chemical connections ` Emissions trading soars ` REACH saves money ` Raising ethical issues ` Managing water in the U.S. | A tiny but powerful microbial fuel cell | Perchlorate found in vitamins and elsewhere | Is EPA's Performance Track running off the rails? | Bottled antimony | Perspective: Will climate change worsen infectious diseases?