It's Carl Sagan day, so it is worth to pause for a moment to remember his contributions. I remember being motivated by him, and his Cosmos series. He always had a way with words, describing the essence of science, apart from all of the details that distract us. In some ways I wish I were more like him, and able to make such a contribution to the world.
So, in memory of Carl, here are a few links to enjoy:
On Humanity: http://www.youtube.com/watch?v=hLkC7ralR30
Pale Blue Dot: http://www.youtube.com/watch?v=wupToqz1e2g
Symphony of Science - We are all Connected: http://www.youtube.com/watch?v=wupToqz1e2g