Our survival requires balancing risk against reward, but some people take risks with abandon whereas others cower. Why?  Consider elite rock climber, Emily Harrington, who became the first woman to free climb the extremely dangerous route Golden Gate, on El Capitan in a day, triumphing only a year after she suffered a near-fatal fall on the same route. According to…

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She’s checking out your on-line profile. “I am a scientist who enjoys bird watching and canoeing.” “Interesting!” she thinks. Then she scrolls to the next profile; also a scientist: “I enjoy white water kayaking, and I study alligators in the wild.” She passes on you with your canoe, and in eager anticipation sends the kayaker…

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