Dr Charles Seife

Fusion - is it the answer to energy?

Dr. Neil Shubin

Evolution from the fish

Guest 1:  Dr. Richard Heinberg - Will Society One Day Collapse?

Guest 2:  Erick Assadorian - State of the World

Seth Shostak and intelligent life in space, Dr. Ray Kurzweil and robots taking over.

Dr. Ken Croswell on the latest in astronomy.