Sport: Those Super Racquets

The names−YFG-50, Boron XT and the XRC−conjure up visions of supersonic test planes or supercharged racing cars. But the sobriquets belong to tennis racquets, crafted in strange shapes of exotic materials, and designed to bestow court greatness on weekend hackers. In search of a bigger "sweet spot," more power and control, manufacturers have imbedded boron fibers in an epoxy matrix, reinforced nylon throat pieces with quartz, turned to the builders of nuclear reactors for ultrasonic welding techniques and altered the spacing of strings. The physics laboratories at Princeton where Albert Einstein once...

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