我们都身处在由朋友、家人、同事等所构建的庞大的社会网络之中。波士顿哈佛大学医学院的医学社会学家尼古拉斯 克里斯塔基斯Nicholas Christakis追踪发现了一系列的特质──诸如快乐和肥胖──是如何从一个人传递到另一个人的，解释了你在社会网络中所处的地位是如何以你意想不到的方式影响着你的生活。 Nicholas Christakis：The hidden influence of socia
THE PRESIDENT: Hello, South Carolina! (Applause.) Thank you! Well, it is good to see everybody. It is good to be back in South Carolina. Now, if you all have a seat, take a seat. If you don’t have a s
June 13, 2007 12:43 P.M. EDT THE PRESIDENT: When Dan told me that he was going to leave the White House so he could spend more time with his three young children and his wife, I never thought I'd be a
President's Radio Address THE PRESIDENT: Good morning. This Tuesday is Election Day. After months of spirited debate and vigorous campaigning, the time has come for Americans to make important decisio
