Astrophysicist Neil deGrasse Tyson.
Photo by Associated Press /Chattanooga Times Free Press .
published Tuesday, October 25th, 2011
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Rather than starting with a monologue full of scientific jargon Tuesday evening, noted astrophysicist Neil deGrasse Tyson — the man once named People magazine's "Sexiest Astrophysicist Alive" — began by posting to his Twitter feed.