“Toxic metals, including “heavy metals,” are individual metals and metal compounds that negatively affect people’s health. In very small amounts, many of these metals are necessary to support life. However, in larger amounts, they become toxic. They may build up in biological systems and become a significant health hazard.” – US Department of Labor’s Occupational Safety and Health Administration

“I do wonder whether there will come a time when we can no longer afford our wastefulness – chemical wastes in rivers, metal wastes everywhere, and atomic wastes buried deep in the earth or sunk in the sea.” – John Steinbeck