The One in Which We Find Out How Water Causes Cancer

A study by the Environmental Working Group has found that drinking water in 35 American cities contains hexavalent chromium, a probable carcinogen that was made famous by the film "Erin Brockovich."The group found hexavalent chromium in the tap water of 31 out of 35 cities sampled. Of those, 25 had levels that exceeded the goal proposed in California, which has been trying aggressively to reduce