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Peter van Uhm is the Netherlands chief of defense, but that does not mean he is pro-war. At TEDxAmsterdam he explains how his career is one shaped by a love of peace, not a desire for bloodshed -- and why we need armies if we want peace.

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Every doctor makes mistakes. But, says physician Brian Goldman, medicine's culture of denial (and shame) keeps doctors from ever talking about those mistakes, or using them to learn and improve. Telling stories from his own long practice, he calls on doctors to start talking about being wrong.