In the heyday of the New York Yankees, manager Joe McCarthy once interviewed a coach being brought up to the majors from a Yankee farm team. "How much do you know about psychology?" McCarthy asked.

The coach said he had studied it in college.

"So you think you're good," said McCarthy.

The coach replied: "I don't know how good I am, but it's a subject I've studied."

"All right," McCarthy said, "I'll give you a test." McCarthy said that a few years before he'd had a problem…