Dr. Seth Shostak on life in outer space, and Dr. Ray Kurzweil addressing the question "will the robots take over?"

Dr. Richard Heinberg - Total ecological collapse

Eric Assadorian - State of the planet

Dr. Robert Lanza on the future of biotech, and Lester Brown on the Fate of the Earth.

Dr. William Calvin on Brief History of the Mind, and Dr. Jay Olshansky on Quest for Immortality.