Carl Sagan discusses the structure of the human brain and its immense complexity and potential.
posted by jonny
1 decade 7 years 1 month 1 week ago • 2,915 views
Documentaries - the truth and other entertainment
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Updated: 1 decade 5 months 2 weeks ago
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1 decade 7 years 1 month 1 week ago • 2,915 views