The peoples of the earth face the future with grave uncertainty, composed almost equally of great hopes and great fears. 世界各国人民都怀着忐忑不安的心情面对着未来，他们既充满希望又满腹忧虑。 In this time of doubt, they look to the Uni

One illustration of the transformational power of technology is in Kibera. 一个与科技改革力量有关的例子发生在基贝拉 Kibera is one of Africa's largest slums. 基贝拉是非洲最大的贫民窟之一 It's on the outskirts of Nairobi, the ca

Now, I want to start with a question: When was the last time you were called "childish"? 首先我要问大家一个问题：上一回别人说你幼稚是什么时候？ For kids like me, being called childish can be a frequent occurrence. 像我这样的小孩，可能经常会

April 6, 2007 Dr. Sharon Hays, White House Office of Science and Technology Policy Jim Connaughton, Chairman, White House Council on Environmental Quality DR. HAYS: Welcome, everyone and thanks to all

Countries like Germany and South Africa and, of course, Rwanda, 像德国和南非，当然还有卢旺达， have found it necessary to build memorials to reflect on the atrocities of their past, in order to heal their national p