THE PRESIDENT: Good morning. Next week, Americans will gather with friends and family to celebrate the Fourth of July. I look forward to spending this Independence Day in Martinsburg, West Virginia, w
DNA is the fundamental molecule the carries genetic instructions that help build the living world. DNA是携带遗传指令最基本的分子，帮助建造了生机勃勃的世界。 Humans have DNA. Pigs have DNA. Even bacteria and some viruses have DN
THE PRESIDENT: Yesterday I had the opportunity to speak to President Uribe of Colombia, and he called to give me the good news that hostages had been rescued, including three Americans that had been h
Hi, everybody. About a year ago, I promised that 2014 would be a breakthrough year for America. And this week, we got more evidence to back that up. In December, our businesses created 240,000 new job
