Thank you very much Professor Kombay for that generous introduction. And let me say, that I never expected to hear such kind words from Dr. Falwell. So in return, I have an invitation of my own. On Ja

Here are some images of clusters of galaxies. 这是一些星团的照片。 They're exactly what they sound like. 正如听上去一样。 They are these huge collections of galaxies, 它们是一堆星系， bound together by their mutual gravity

Remarks of President Barack ObamaWeekly AddressWashington, D.C. Good morning. I want to briefly share some news about our economy, and talk about the work that we’re doing both to protect Americ

How much do you get paid? Don't answer that out loud. 你的工资是多少？先别说出来。 But put a number in your head. 在脑子里想一下。 Now: How much do you think the person sitting next to you gets paid? Again, don't answer ou

Thank you very much. Good afternoon. It’s wonderful to have so many of you here, in particular to see all of the kids who have been able to join us today. Thank you all for being here. Thank you first