Season 4

01 Diamond Factory / Anthrax Investigation / Auto-Tune / Luis Von Ahn Episode 130th June 2009 02 Hunt for Alien Earths / Art Authentication / Maydianne Andrade / Autism Genes Episode 27th July 2009 Join astronomers hunting for Earth-like planets, see how computers distinguish authentic art from forgeries, meet a spider biologist who studies sexual cannibalism, and learn about genes that may be involved in causing autism. 03 Marathon Mouse/Dinosaur Plague/Franklin Chang-Díaz/Space Storms Episode 314th July 2009 Watch how an "exercise pill" turns couch-potato mice into athletes, explore a controversial new theory of what killed the dinosaurs, meet the first Latino-American astronaut, and find out why the beautiful northern lights signal a threat to our electronic society. 04 Picky Eaters/Capturing Carbon/Sea Lions and Walruses/Sangeeta Bhatia Episode 421st July 2009 Discover why picky eaters may have a genetic excuse, learn about a new strategy for capturing carbon dioxide from the atmosphere, see just how intelligent marine mammals can be, and meet a biomedical engineer who has figured out a way to make tiny livers in her lab. 05 Moon Smasher/Secrets in the Salt/Bird Brains/Lonnie Thompson Episode 528th July 2009 Follow a NASA satellite looking for water on the moon, see what ancient salt deposits reveal about life 250 million years ago, learn how bird brains are remarkably similar to our own, and meet a climatologist who digs for clues to climate change in the world's highest glaciers. 06 Public Genomes/Algae Fuel/Arctic Ocean Seafloor/Yoky Matsuoka Episode 618th August 2009 Explore the controversies behind genetic testing and genome sequencing, learn about algae fuel, follow an expedition to the Arctic Ocean seafloor, and meet a woman engineer designing prosthetic limbs controlled by human thought. 07 Saving Hubble Update/Gangster Birds/Alfredo Quiñones-Hinojosa/How Memory Works Episode 725th August 2009 Get an astronaut's view of the Hubble repair mission, find out why cowbirds are called "gangster birds," meet a Mexican immigrant farmworker-turned-brain surgeon, and learn how neuroscientists are finding ways to erase memories. 08 Earthquakes in the Midwest/Sleep/Sang-Mook Lee/First Primates Episode 81st September 2009 Using new data from cave stalagmites and the Mississippi riverbed to understand how and why earthquakes strike in the heartland; the crucial role sleep plays in strengthening memories and facilitating learning; a profile of marine geologist Sang-Mook Lee; paleontologist Jonathan Bloch, who thinks that tiny bones embedded in limestone may be the evolutionary evidence of the creatures that evolved into primates.