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Space Exploration & Policy

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August 21, 2012
Past, Present, and Future of NASA - U.S. Senate Testimony

March 7, 2012
Reddit AMA (Ask Me Anything) - March 2012

March 1, 2012
King of the Cosmos

January 1, 2012
Reddit AMA (Ask Me Anything) - December 2011

December 17, 2011
Reddit AMA (Ask Me Anything) - November 2011

November 13, 2011

Most Requested Universe Essays

A few favorite essays in over 10 years of articles for Natural History magazine.

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Some Personal Reflections

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