Issue Date: August 27, 2007
Being a chemist, I go through life expecting to find chemistry at every turn. Even so, I was pleasantly surprised a few weekends ago to discover chemistry at work in an unexpected way and in an unexpected place: Simple limestone is being used to adjust the pH of streams affected by acidic coal-mine drainage in Pennsylvania forests.
Large-scale anthracite coal mining began in eastern Pennsylvania before the 1850s and reached its peak in the late . . .
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