Heterogeneity in societies will be the rule in the 21st century, and failure to recognize and plan for such diversity can lead to serious crime problems.

社会的多样性将成为21世纪的规则，如果未能认识到这种多样性并为之做准备，可能会造成严重的犯罪问题。

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Rule of Diversity: Distrust all claims for "one true way".

多样原则：绝不要去相信什么所谓“不二法则”的言论。

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And thanks to the efforts of Dan Rooney, an older white owner of the Pittsburgh Steelers with a good heart, the Rooney Rule that he authored while NFL chair of diversity, and its progeny in the name of Tony Dungy, the ideal has had application in professional football.

FORBES: What's Silently Super About This Bowl? A Tribute To The Rooneys And Tony Dungy

"These are the lowest head coach diversity numbers the league has seen since 2003, when the Rooney Rule was just implemented, " wrote Harry Carson, the Fritz Pollard Alliance's executive director, in a letter to NFL officials regarding the drop from six to four black head coaches in the league after this past regular season.

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