"Medical doctors, yes," Chase agrees, because generally, that's what they should be doing. "I guess the best way of explaining it is that my department looks at the puzzles, after all the rest of the doctors have had their chance to diagnose and they couldn't figure it out. We're the last resort." And they definitely come up with plenty of solutions that skirt around the near-impossible, but sometimes, they're right.

He's not sure how to explain it better, not without getting into a show and tell. "Really, it's a lot of frustration with some big victories."