MARC THIESSEN: Rats! (A Tale of Government Intervention Gone Awry). “A few years ago, officials in Brooklyn, New York came up with a seemingly brilliant idea to deal with the rat-infestation problem in their borough: release opossums into the neighborhood to eat the rats. Once the rat population disappeared, officials surmised, the opossums would have nothing to eat and would disappear as well. Like most ham-handed government efforts at social engineering, this one backfired: the opossums showed no interest in the rats, taking instead to rummaging through trash for food. Meanwhile, they procreated like mad. Result: Brooklyn is now overrun with rats and opossums.” Wasn’t there a Simpsons episode along these lines? . . . .

We could always airdrop tylenol-stuffed mice.