Diamond Factory, Anthrax Investigation, Auto-Tun
Episode: 4x01 | Airdate: Jun 30, 2009
Episodes
Hunt for Alien Earths, Art Authentication
Episode: 4x02 | Airdate: Jul 7, 2009
Marathon Mouse, Dinosaur Plague
Episode: 4x03 | Airdate: Jul 14, 2009
Picky Eaters, Capturing Carbon, Sea Lions and Walruses
Episode: 4x04 | Airdate: Jul 21, 2009
Moon Smasher, Secrets in the Salt, Bird Brains
Episode: 4x05 | Airdate: Jul 28, 2009
Public Genomes, Algae Fuel, Arctic Ocean Seafloor
Episode: 4x06 | Airdate: Aug 18, 2009
Saving Hubble Update, Gangster Birds
Episode: 4x07 | Airdate: Aug 25, 2009
Sleep, First Primates, Earthquakes in the Midwest
Episode: 4x08 | Airdate: Sep 1, 2009