I love Carl Sagan. I once took a community college class called "the history of technology" when I lived in Virginia in the 80's. The teacher used Cosmos as the material, which was really good because it did go in to how we developed technology and why so many years went by before the industrial age, even though the technology existed. But the man was so religious that he usually spent 15 minutes of class bemoaning Carl Sagan's supposed atheism.