"Turkish cancer villages warn of epidemic to come along North Dakota’s roads
In Dunn County, North Dakota, the roads are paved with a unique danger. Over 300 miles of them are covered with gravel taken from the local North Killdeer Mountains. This rock is rich in a mineral called erionite that behaves not unlike asbestos. Both cause cancer, but according to animal studies, erionite is anywhere from 200 to 800 times more effective at it than its more famous counterpart."
More:Turkish cancer villages warn of epidemic to come along North Dakota’s roads | Not Exactly Rocket Science | Discover Magazine