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  5. Except in pure mathematics, nothing is known for certain...

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

Carl Sagan
Mathematics, Certain, Pure
Carl Sagan (2011). “Demon-Haunted World: Science as a Candle in the Dark”, p.51, Ballantine Books
Except in pure mathematics, nothing is known for certain (although much is certainly false).