I have recently discovered a treasure trove of Documentaries on Google. No, not Documentary clips, but full length quality Docus. If I may bring your attention to two of my absolute favorites.
The first is The Elegant Universe,
A book i loved that makes astonishingly enough, an even better pair of documentaries, narrated by Brian Greene Himself.
Part 1. Einstein's Universe
Part 2. String's The Thing
Now, for the more intense of the two.
The shocking title does no justice to the incredible arguments that Richard Dawkins makes against religion and its assault on reason and science. Whether or not you agree with the content, this documentary must give you pause. Narrated by Dawkins, who is an incredible thinker and is very passionate about his arguments. The gem of these documentaries is an interview with Ted Haggard, who gets all uppity when he is challenged by Dawkins as someone who is "telling people what to think". Not to be missed.
Part 1. The God Delusion
Part2. The Virus of Faith