"There isn't much doubt that like other animal societies, those of Homo sapiens involved plenty of cooperation, which might have been considerably enhanced, one would suppose, by the emergence of the remarkable instrument of language."

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It's critically important that we have governments to work with, that we have entities to work with. President Hadi has been a good partner in that, and we would hope that the next set of leaders that govern Yemen will also take the same approach to cooperation with the United States.

— Chuck Hagel