Science: Chains Cast Off?

U.S. motorists, skidding, churning, and bogging down in one of the snowiest winters on record, last week heard gripping news. At long last there has apparently been developed an honest-to-goodness nonskid tire.

A group of amateur inventors in Washington, Pa. announced that they had finally found the right adhesive combination. Their new tire, which works by friction, seems to give better traction than snow tires based on a gripping action. The tire material, a mixture of rubber and abrasives, feels gritty, like fine sandpaper. Designed for year-round use, it works equally well...

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