April 1, 2005: Hour One: Earthquake / Biodefense / Cancer Genome Project
April 1, 2005: Hour Two: Optical Chip / DIY
April 8, 2005: Hour One: Terri Schiavo and End-of-Life Issues
April 8, 2005: Hour Two: Aging
April 15, 2005: Hour One: Marburg Update / Jules Verne / Moon Base Site / Journey to the Center of the Earth
April 15, 2005: Hour Two: Polio Vaccine Anniversary / Western Weather Effects
April 22, 2005: Hour One: Earth Day 2005: Climate Change Update / Plug-in Hybrids
April 22, 2005: Hour Two: Earth Day 2005: State of the Earth's Ecosystems / Paper or Plastic?
April 29, 2005: Hour One: Stem Cell Research and Policy Update / Teaching Evolution Update
April 29, 2005: Hour Two: Popular Math