| In a study comparing siblings who play major league baseball, researchers found that younger brothers are 10.6 times more likely to try to steal bases—and 3.2 times more likely to be successful at it. Frank J. Sulloway of UC Berkeley and Richard L. Zweigenhaft of Guilford College analyzed the performance of 700 brothers who were major leaguers in an effort to test a hypothesis from evolutionary theory that younger siblings are more likely than older siblings to participate in high-risk activities. |
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