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I’ve just discovered my new favorite astrophysicist, Dr. Neil deGrasse Tyson, director of the Hayden Planetarium.  He’s a great communicator who makes science accessible , he’s funny, and he knows his stuff!  Here he is talking about the beginning of the universe, Pluto, and things that want to kill us.  And here he is explaining how the tides work (and poking a moon-shaped hole in Bill O’Reilly’s proof of God’s existence).