San Francisco Giants star Barry Bonds hit his 756th home run Tuesday, breaking Hank Aaron's lifetime record. But the baseball legend's link to a steroids scandal raises questions about his achievement. Sports analysts examine the milestone and the controversy.

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A home run is one of the biggest crowd-pleasers in baseball. A physicist, physics teacher and pitching coach talk about the physics behind a home run, a 90-mile-per-hour fastball and other baseball feats.

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Major League Baseball players and owners on Friday agreed to a tentative collective bargaining agreement that would avert a baseball strike.

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