1. "Extraordinary claims require extraordinary evidence."
- Quote by Carl Sagan
2. "Persian envoy "our arrows will black out the sun..." Dienekes of the Spartans.."Good, then we'll fight in the shade."
- Steven Pressfield, Gates of Fire: An Epic Novel of the Battle of Thermopylae
5. "a skeptic's mantra is "extraordinary beliefs require extraordinary evidence."
- Thomas E. Kida, Don't Believe Everything You Think: The 6 Basic Mistakes We Make in Thinking
8. "I believe that the extraordinary should certainly be pursued. But extraordinary claims require extraordinary evidence."
- Carl Sagan, Broca's Brain: Reflections on the Romance of Science
9. "While Leonidas was preparing to make his stand, a Persian envoy arrived. The envoy explained to Leonidas the futility of trying to resist the advance of the Great King's army and demanded that the Greeks lay down their arms and submit to the might of Persia. Leonidas laconically told Xerxes, "Come and get them."
- Quote by Plutarch