Video 1: Archaea (2:58)

Video 2: One of Nature's Most Amazing Sights (2:42)

Video 3: Bacteria (2:32)

Video 4: Bacteria Shape (3:54)

Video 5: What Is the Black Plague? (3:11)

Video 6: The Hidden Perils of Permafrost (3:11)

Video 7: Rhizobia (0:29)