Bobby Thomson's ''shot heard 'round the world'' is the most famous home run ever. Not only did it clinch a trip to the '51 World Series for the New York Giants, it did so at the expense of the rival Brooklyn Dodgers. But according to ace Wall Street Journal reporter Joshua Prager in The Echoing Green, there was more to it than Ralph Branca's fat pitch and Thomson's clutch swing. The Giants had been secretly stealing opponents' signs with binoculars and a relay system of wires and buzzers Thomson could have known what pitch was coming. Does this make him any less a hero, or Branca any less a goat? Let the call-in radio debate begin.