The Origin and Evolution of Life
Charles Darwin and evolution are examined. Also: the Burgess Shale fossils, which offer a glimpse of life on Earth 505 million years ago; and the KT asteroid that’s believed to have contributed to the extinction of the dinosaurs.
http://www.guba.com/watch/2001011118?du
Astronomy
Breakthroughs in astronomy include the discovery of planetary movement; moons of other planets; [...]