> Extraordinary claims require extraordinary evidence I see this quote often in this thread. It is stated as a fact, with attribution to Carl Sagan. Yet I see

> Extraordinary claims require extraordinary evidence I see this quote often in this thread. It is stated as a fact, with attribution to Carl Sagan. Yet I see no supporting reasoning for this conclusion. I find it ironic that - in a thread with so much emphasis on evidence - this statement is repeated as if it was gospel. I ask: why? What is an extraordinary claim? What constitutes extraordinary evidence?