Daron Rahlves takes risks mainly for change and excitement.

达伦·拉尔维斯冒险主要是为了追求改变与刺激。

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For example, skier Daron Rahlves says that being afraid makes him try harder to succeed.

例如，滑雪者达伦·拉尔维斯说，恐惧促使他更努力地争取成功。

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His estimates of per head GDP provide a useful empirical crosscheck for a grand thesis proposed by Daron Acemoglu, Simon Johnson and James Robinson in 2005.

麦迪森对人均GDP的估算，为达龙•阿西莫·格鲁、西蒙·约翰逊和詹姆斯·罗宾逊于2005年提出的重要论文提供了有用的经验核查。

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Recent books like Why Nations Fail, by Daron Acemoglu and James Robinson, take up this fascinating subject for our own age.

FORBES: How Do Countries Grow Rich? It's Much Easier Than You Think

Eco-friendly Daron "Farmer D" Joffe then buys this soil and uses it in his urban gardens and at his Organic Garden Center.

CNN: Downtown Atlanta recycles self into a Zero Waste Zone

In the day's opening race, America's Daron Rahlves was involved in a spectacular crash when the 36-year-old, one of the United States' most decorated downhillers, collided with France's Ted Piccard and landed hard on his back.

BBC: Ski cross gold for Switzerland's Michael Schmid