Mobility in developing world cities 在世界上发展中国家城市里 is a very peculiar challenge, 流动性是一个非常严峻的挑战 because different from health 因为它和健康 or education or housing, 教育或住房不同 it tends to get worse as societies be
So here's a great puzzle: in a universe ruled by the second law of thermodynamics, 所以，这就是个大谜团：在宇宙中，在被热力学第二定律规范下， how is it possible to generate the sort of complexity I've described, 怎么样才有可能产生这种我刚才论述的
May 7, 2007 8:10 P.M. EDT PRESIDENT BUSH: Your Majesty, and Your Royal Highness, distinguished guests, Laura and I offer you a warm welcome to the White House. We're really glad you're here. Tonight i
Happy New Year! Everybody. This week, I traveled to Cleveland, Ohio, to talk with folks about the biggest challenge we face as a country – rebuild our economy so that, once again, hard work pays
