Well, welcome to the White House,everybody. And that was one of the best introductions I’ve ever had. (Applause.) So we’re so proud of Kiara for the introduction and for sharing yourstory, and you’re
Or here's a video that I made as part of my show "Crash Course," talking about World War I: 还有这个视频，是我的节目《速成班》中的一期，讲的是第一次世界大战： The immediate cause was of course the assassination in Sarajevo of the Aus
珍惜时间 Making Good Use Of Time 四—五年级 Goodmorning/afternoon,everybody!A famous American poet says , "Life is short, study is long." Everyone should work hard and study well. Never waste any time.
I started doing some research then, and this was the 25-year journey, and started finding out that actually 我从那时起开始从事相关的研究，到现在已经二十五年了我最早的发现就是 human beings as primates have far smaller stomachs than sh
