A Science Odyssey - Origins (2/11)

The earthquake that shatters San Francisco in 1906 opens a century of explosive discoveries and debates in the earth sciences. See the Earth through the eyes of Alfred Wegener, who struggles to convince the scientific establishment that continents move. Watch as radiodating techniques increase Earth's estimated age - sometimes inspiring skepticism if not outrage. Meanwhile, a parallel upheaval rumbles the life sciences, where new evidence of our primate ancestors and the discovery of DNA's structure stir up controversies of their own. Ancient fossils and living cells give up their secrets to change our view of our species and the mechanics of life.