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1. "Extraordinary claims require extraordinary evidence." ~ Carl Sagan

See "Marcello Truzzi" on Wikipedia or the Carl Sagan article. Truzzi coined it first as "Extraordinary claims require extraordinary proof."

2. "Everyone who believes in telekinesis, raise my hand." ~ James Randi, AKA "The Amazing Randi"

Randi said he didn't coin this. See origin info at:


  • Any sufficiently advanced technology is indistinguishable from magic.
  • Extraordinary claims require extraordinary evidence.
  • If you see a two-headed pig, keep your mouth shut.
  • There is a principle which is a bar against all information, which is proof against all arguments and which cannot fail to keep a man in everlasting ignorance -- that principle is contempt prior to investigation.
  • The universe is not only queerer than we imagine; it is queerer than we can imagine.