NBC: It's difficult to find scientists who have not lined up on one side or another on hydraulic fracking for oil and natural gas. The anti-fracking groups have their scientific talking points, and the pro-fracking groups have their counterclaims. Some of the scientists who have put out pro-fracking reports have turned out to be tied to the industry. When even the federal panel formed to study the issue is stacked with industry supporters, it's hard for environmentalists and health advocates to believe...