In 2005, Andreas Karch of the University of Washington, Seattle, and Lisa Randall of Harvard University came up with a more mechanistic explanation of the mystery of threeness.

2005年，美国西雅图华盛顿大学的安德烈·卡奇和哈佛大学丽莎兰·德尔提出了一个更机械论观点的神秘三重性（The state of being three）的解释。

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Dr Karch told BBC News Online at the time that he studied similar modern cases.

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Karch retired from McKinsey in 2000, and now serves as a member of the company's advisory council.

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Karch Kiraly, the assistant coach of the U.S. women's volleyball team and a three-time Olympic gold medalist in the sport, says that physical contact is a sign of closeness.

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