“No one knows what causes leukemia,” explained Cheeseman. “And no one knows what caused this cluster. I personally think it’s just a matter of chance. If you took a hundred pennies and threw them in the air, half would land heads and the other half would land tails. If you looked around carefully, you’d probably be able to find some heads grouped together in a cluster. But it’s purely a matter of chance. No one can explain it.”

Jonathan Harr, A Civil Action, loc. 879