NPR, May 16, 2012 Jon Hamilton A proposed study of people in northern Pennsylvania could help resolve a national debate about whether the natural gas boom is making people sick. The study would look at detailed health histories on hundreds of thousands of people who live near the Marcellus Shale, a rock formation in which energy companies have already drilled about 5,000 natural gas wells. If the study goes forward, it would be the first large-scale, scientifically rigorous assessment of the health effects of gas production.  Read More.....