And are we alone?. 二是我们是否唯一。 Those 2 deep questions drive us all through our whole lives. 这两个深刻问题伴随着我们的整个生命。 And to answer those 2 questions. 要回答这两个问题。 we have to continue to explore outer space. 我们就需
I want to start by doing an experiment. I'm going to play three videos of a rainy day. 我想用一个实验来开始我的演讲。我将给你们播放三段雨天的视频。 But I've replaced the audio of one of the videos, and instead of the sound of rain
And it seems to me that the first question 我的看法是， is entirely a biology question, 第一个问题完全是生物学的问题， and it's extremely hard to answer. 这是非常难回答。 One has to be very speculative, 一个人必须非常投机， and many of
October 7, 2007 THE PRESIDENT: Thanks for the warm welcome. David, thank you very much for your introduction. Nothing better than being introduced by an old fire chief. And I thank you for your servic
