Neil deGrasse Tyson Will Blow Your Mind With "Cosmos" At SXSW 2014

Neil deGrasse Tyson Will Blow Your Mind With "Cosmos" At SXSW 2014
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Neil deGrasse Tyson and Ann Druyan discuss the new show "Cosmos," and how it feels to walk in the footsteps of Carl Sagan. Tyson also shared "Gravity" hits and misses, and what really happens when you cry in space.

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