I don't see wh From a distance, the lake near Oberrothenback, Germany, appears inviting, but looks are deceiving. The lake contains enough toxins to kill thousands of people, its water polluted with heavy metals, low-level radioactive chemical waste, and 22,500 tons of arsenic. Radon, a radioactive by-product of uranium, permeates the soil. High death rates among farm animals and pets have been traced to drinking from the polluted lake. Cancer rates and respiratory disorders among the human residents nearby are far above normal. This isn't surprising, given the regionís rather toxic history.