On a still bigger scale, we see entire galaxies of stars. We see entire ecosystems where gas is being recycled. 在更大的范围里，我们看到恒星组成的星系。我们看到完整的生态系统，看到气体被回收利用。 And to the cosmologist, these galaxies are ju
In three dimensions, we did a project last year at TED Global with Autodesk and Arthur Olson where we looked at autonomous parts -- so individual parts not pre-connected that can come together on thei
Hi, everybody. Over the past month, I've been visiting towns across America, talking about what our country needs to do to secure a better bargain for the middle class. This week, I met with high scho
