There was a small population of human ancestors who had what it took to survive a drought in ancient Africa. This movie showed what might have happened. Whatever the details are, the drought probably helped in the development of our larger brains.
The primitive apes in the movie remind me of 21st century Muslims for some reason.
The must-see video is at http://vimeo.com/4176485 and at http://www.youtube.com/watch?v=ML1OZCHixR0.
The incredible music, set your volume to full blast: Also sprach Zarathustra~Thus Spoke Zarathustra - Tone Poem by Richard Strauss (the introduction fanfare "Sunrise")
The Dawn of Man