March 5, 2004: Hour One: Water on Mars? / Genetically Engineered Organisms / Spring Sky
March 5, 2004: Hour Two: Genes of the Sargasso Sea / Cosmology Update
March 12, 2004: Hour One: Smallpox Vaccine / Robot Race / Hubble Ultra Deep Field
March 12, 2004: Hour Two: Steven Johnson's 'Mind Wide Open' / Einstein at 125
March 19, 2004: Hour One: New Planetoid / March Madness / Cholesterol Update
March 19, 2004: Hour Two: Amazon Health / Human Origins Update
March 26, 2004: Hour One: Mars Update / Microsoft Antitrust / Exxon Valdez Anniversary
March 26, 2004: Hour Two: Stem Cell Research Update / Global Health Risks