• Except in pure mathematics, nothing is known for certain (although much is certainly false).

  Source: Demon-Haunted World: Science as a Candle in the Dark (2011) 51

  Carl Sagan
  American astronomer, cosmologist, astrophysicist and author 1934-1996
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Subjects in these quotes:

1. mathematics
2. (although
3. certainly
4. false)

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Except in pure mathematics, nothing is known for certain (although much is certainly false). by : Carl Sagan

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