A flaming replica of 17th-century London floats on the River Thames on Sunday, part of an event to mark the 350th anniversary of the Great Fire of London. Justin Tallis/AFP/Getty Images hide caption

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Justin Tallis/AFP/Getty Images

A picture taken with a smart phone shows Syrian refugees queuing at one of the many UNHCR (United Nations Refugee Agency) registration centers in Lebanon. At the same time that civil wars and the Ebola outbreak are plaguing countries in Africa, Syrian and Iraqi refugees are seeking help from agencies. Joseph Eid/AFP/Getty Images hide caption

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Joseph Eid/AFP/Getty Images

World's Aid Agencies Stretched To Their Limits By Simultaneous Crises

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The "RoboSimian" from NASA's Jet Propulsion Laboratory has the advantage of being able to grasp things with all four limbs, like a chimp. It will compete in the DARPA Robotics Challenge. NASA/JPL-Caltech hide caption

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NASA/JPL-Caltech

A Contest To Build A Disaster-Ready Robot

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