가입 후 초대 링크를 공유하면 동영상 재생 및 초대 보상을 받을 수 있습니다.

Rob Henderson
@robkhenderson
Best-selling author of "Troubled: A Memoir of Foster Care, Family, and Social Class" | Senior Fellow, @ManhattanInst | All Views My Own
가입 March 2011
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"Wolves and dogs cycle through an elaborate sequence of warnings before a fight...The system evolved this way because violence is expensive. Even the winner often gets hurt. The architecture of threat signaling exists to make actual combat unnecessary"
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