101Sleep讲解

133The Role of the Ocean in Controlling Climate讲解

第8篇Latin America in the Nineteenth Century

第39篇Deriving Scientific Facts from Theories

第70篇Imitation in Monkeys and Apes

Alaska and Bark Beetles Over the twentieth century, global temperatures increased by an average of about 0.7 degrees Celsius, but some places have warmed a lot more than this, and...

第135篇Costs of Quitting a Job

第167篇Europe in the High Middle Ages

第198篇Environmental Impact of the Anasazi

第232篇The Rise of Moscow