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string theory

Horizon Interview, PBS, July 7, 2009

Cosmic Quandaries

Q & A about the universe.

The Commonwealth Club of California, February 9, 2007

A talk on Death By Black Hole which touches on a variety of issues in astrophysics and space exploration.

Excerpt: Pluto and planethood

String Theory

NOVA, Commenting on string theory and its relevance to modern physics from NOVA's The Elegant Universe.