What does it mean to be courageous? Is it an automatic response or a conscious choice? In this hour, TED speakers examine the nature of courage and what it takes to risk everything to do the right thing. Margaret Heffernan looks at why we keep ourselves from seeing injustices, and the courage it takes to stand up and combat them. As a war reporter, Janine di Giovanni goes to some of the most dangerous places on earth and tells the story people who demonstrate courage daily. Kimberly Motley defends Afghan women and girls forced into marriage or wrongly accused of adultery, and she does this without a bodyguard, a headscarf or speaking the language. Leana Wen has launched a campaign to expose systemic corruption in the medical field, despite threats from fellow doctors.