Mrs. Obama: Hey! What's going on? Thank you all so much. You guys, that's a command – rest yourselves. We're almost at the end. Hello, everyone. And, may I say for the last time officially, welcome to

But to put that in context: 我们把这些数字写下来： 5.93 million years ago 593万年前 was when our earliest primate human ancestors stood up. 我们人类的祖先灵长类开始了直立行走 That was the first upright primate. 这是第一种直立行走的灵长类动物 Okay

吉尔伯特泰勒所拥有的研究机会不是每一位脑科学家都所希望拥有的：她有严重中风，并且观察到她大脑的功能--运动，语言，自我意识-一个接一个关闭。这真是令人惊讶的故事。 Jill Bolte Taylor's Powerful Stroke of Insight吉尔伯特泰勒的奇迹 I grew up to study the brain because I have a brother who has

and may confidently expect that the flag which has waved its untarnished folds over every sea will still float in undiminished honor. 并自信地期望那曾在每一海面上飘扬而不受沾污的旗帜仍将以未损的荣耀飘扬。 But these,like many other subj

Mr. President, Mr. Speaker, Members of the Congress of the United States: The gravity of the situation which confronts the world today necessitates my appearance before a joint session of the Congress