Tag:Sagan
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Articles
- Carl Sagan (10)
- Pale Blue Dot (6)
- Cosmos: A Personal Voyage (5)
- The Demon-Haunted World (1)
- Lynn Margulis (1)
- Extinction event (1)evolution science extinction nature environment paleontology interesting ele global geology extraordinary extinction_level_event history sagan temp evidence required require misc.scifi claims carl bloggable biodiversity @buckyfuller catastrophe citation endoftheworld earth cycle environmentalscience
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