单词:Christa
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President Mubarak is the leader of a country that's in the middle of a political uprising. Protests against the government have been going on all across Egypt, and experts think there could be a lot more demonstrations starting today. The Muslim Brot
January 28th, 1986Space Shuttle Challenger explodes 73 seconds after takeoff from Cape Canaveral, Florida. All seven crew members on board the Challenger, among them school teacher Christa McAuliffe, are killed. President Ronald Regan tells a shocked
January 28th, 1986Space Shuttle Challenger explodes 73 seconds after takeoff from Cape Canaveral, Florida. All seven crew members on board the Challenger, among them school teacher Christa McAuliffe, are killed. President Ronald Regan tells a shocked
January 28th, 1986Space Shuttle Challenger explodes 73 seconds after takeoff from Cape Canaveral, Florida. All seven crew members on board the Challenger, among them school teacher Christa McAuliffe, are killed. President Ronald Regan tells a shocked
January 28th, 1986Space Shuttle Challenger explodes 73 seconds after takeoff from Cape Canaveral, Florida. All seven crew members on board the Challenger, among them school teacher Christa McAuliffe, are killed. President Ronald Regan tells a shocked
Science and Technolgy 科技 The evolution of co-operation 合作关系的演变 Make or break? 建立还是终止? Social networking tames cheats 社交网络驯服欺骗者 HOW people collaborate, in the face of numerous temptations to cheat, is
演讲简介:在摸清错综复杂的人际关系网之后,尼古拉斯克里斯塔吉斯 (Nicholas Christakis)和同事詹姆斯福乐开始研究怎么善用这一信息。这里,他介绍了新出笼的发现:这些社会关系可以被用来
Science and techonolgy 科学技术 The evolution of co-operation 合作关系的演变 Make or break? 建立还是终止? Social networking tames cheats 社交网络驯服欺骗者 HOW people collaborate, in the face of numerous temptations to che
HOW people collaborate, in the face of numerous temptations to cheat, is an important field of psychological and economic research. A lot of this research focuses on the tit-for-tat theory of co-operation: that humans are disposed, when dealing with
DAVID GREENE, HOST: There's a video that went viral on Twitter recently. It has a mom sneaking up on her 6-year-old son as he's doing his math homework. And she catches him asking Alexa, Amazon's smart speaker, for help. (SOUNDBITE OF ARCHIVED RECORD