Diamond Factory / Anthrax Investigation / Auto-Tune / Luis Von Ahn (S4E1)
6/30/2009
Hunt for Alien Earths / Art Authentication / Maydianne Andrade / Autism Genes (S4E2)
7/7/2009
Marathon Mouse/Dinosaur Plague/Franklin Chang-Díaz/Space Storms (S4E3)
7/14/2009
Picky Eaters/Capturing Carbon/Sea Lions and Walruses/Sangeeta Bhatia (S4E4)
7/21/2009
Moon Smasher/Secrets in the Salt/Bird Brains/Lonnie Thompson (S4E5)
7/28/2009
Public Genomes/Algae Fuel/Arctic Ocean Seafloor/Yoky Matsuoka (S4E6)
8/18/2009
Saving Hubble Update/Gangster Birds/Alfredo Quiñones-Hinojosa/How Memory Works (S4E7)
8/25/2009
Earthquakes in the Midwest/Sleep/Sang-Mook Lee/First Primates (S4E8)
9/1/2009
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