The madness started, as baseball madness tends to start, with the New York Yankees: At the end of March, during the opening weekend of the new season, the team's first three batters hit home runs on the first three pitches thrown their way. The final score, 20'9, was almost too good to be true. And then, everybody noticed the bats. A handful of Yankees had used unconventional instruments to hit their home runs: Their bats bulged out a little near the end, such that they were shaped more like bowling pins than clubs. It turned out they'd been designed by an MIT-trained physicist and were tailored to each player's swing, with the bulge positioned at the place on the bat where that player tends to hit the ball. Yes, after at least a century's worth of baseball bats that all looked more or less the same''it must be made of wood, and may be of any length to suit the striker,' reads a set of rules from 1861'the art of making striker's wood had at last produced a major innovation. After...
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