National Geographic: Dirk DeTurck had a years-old rash that wouldn't go away, his wife's hair came out in chunks, and anytime they lingered outside their house for more than an hour, splitting headaches set in.
They were certain the cause was simply breathing the air in Greenbrier, Arkansas, the rural community to which they'd retired a decade ago. They blamed the gas wells around them. But state officials didn't investigate.
So DeTurck leapt at the chance to help with research that posed a pressing question: What's...