Here is a wonderful discussion between Neil deGrasse Tyson and Stephen Colbert. If you aren't familiar with Neil deGrasse Tyson, here is a great way to start that beautiful relationship. He's an astrophysicist best known for hosting NOVA and various science shows, and generally for explaining and popularizing science. He's also the person I most admire in science, because of his way of demystifying it and making it understandable and approachable. I'm a huge fan of taking something "too complex" to be understood by laypeople and showing how anyone can grasp it if you work with them to understand it.
Summary: He is a great man, and inspiring to listen to. And here is him being interviewed by Stephen Colbert, who (it turns out) is also an inspiring and deep thinker.