Lester Brown - State of the World

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George Johnson - women scientists

Michael Lemonick - The Big Bang

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Dr. Frank Melia - Black Hole Physics

Dr. Richard Gott - Time Travel

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Dr. William Calvin - Brief History of the Mind

Dr. Jay Olshansky - Science of Aging

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Guest: Dr. Joseph Romm

Topic: Hell or High Water

Guest: Travis Bradford

Topic: Solar revolution

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Dr Charles Seife

Fusion - is it the answer to energy?

Dr. Neil Shubin

Evolution from the fish

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

Guest 2:  Erick Assadorian - State of the World

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

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Dr. Ken Croswell on the latest in astronomy.

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Dr. Robert Lanza on the state of Biotechnology, and Lester Brown on the state of the world.

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