Neil deGrasse Tyson does a 12-part series of lectures on his favorite topics. This first one is about why so many things in the universe are round:

The Universe 1 – Neil deGrasse Tyson – On Being Round

http://www.youtube.com/watch?v=sidLNXlTyU4

1 of 12 lectures by astrophysicist Neil deGrasse Tyson.


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