Neve Happen

"Nobody will ever run a four-minute mile," says a character in John L. Parker Jr's Again to Carthage.  "Physically can't be done.  You can't drive a golf ball 300 yards. Never happen.  No one can throw a hundred-mile-an-hour fast ball and no one can hit it out of the stadium. All of it is beyond human capacity."

And no one can run a two-hour marathon.  Oh wait.  Not long, but wait.