So we know that in primate hierarchies, if an alpha needs to take over, 灵长动物的社群阶级里，如果一个强势雄性想要夺权， if an individual needs to take over an alpha role sort of suddenly, 如果一个雄性突然想要争取首领这个角色， within a few da
May 20, 2008 THE PRESIDENT: Laura and I have come to the Chinese Embassy -- Mr. Ambassador, thank you very much. Madam, thank you very much. We've come to express our country's condolences for those w
Good morning. This week I am traveling in Europe, where I am meeting with world leaders to discuss ways to address challenges like climate change, to work together to combat diseases like malaria and
