Walt Disney, who made a mouse enter taining, last week made a mousetrap educational. To illustrate an atomic chain reaction for Our Friend the Atom on ABC's Disneyland, Disney moviemakers crowded 200 mousetraps together, each with a pair of pingpong balls poised on its taut spring. When Physicist Heinz Haber, the show's narrator, tossed a single pingpong ball into the arena of massed traps—so that each sprung trap would fire two balls to spring two more traps—the screen erupted into a chaos of snaps, pings and pongs. The mousetraps were the brightest touch...
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