Last night on Sunday Night Baseball Joe Morgan was critical of Boston's Mike Cameron turning for the dogout when the second baseman was circling under his infield fly with a runner on first and one out. In light of the infield fly rule, which was never mentioned, I wondered why they were critical of Cameron. And I also wondered why they did not mention the infield fly rule. And I wondered why the infield fly rule was not called by the umpire. I TIVO'd the segment and then Googled the infield fly rule. Can you define the infield fly rule?