Guest: Dr. Peter Ward

Topic: The Flooded Earth

Guest 1: Dr. Simon Singh Topic: The Big Bang Guest 2: Dr. Spencer Wells Topic: Origin of the human race

Guest 1: Dr. Seth Shostak

Topic: Intelligent Life in the universe

Guest 2: Dr. Ray Kurzweil

Topic: Will the machines take over?

Guest 1: Dr. Fulvia Melia

Topic: Black holes

Guest 2: Dr. Richard Gott

Topic: Time travel