Claims Quote by Pierre-Simon Laplace

Extraordinary claims require extraordinary evidence.

— Carl Sagan

Extraordinary claims demand extraordinary evidence

— Carl Sagan

Extraordinary observations require extraordinary evidence to make them believable.

— Carl Sagan

“extraordinary claims require extraordinary investigation”

— Anonymous

Extraordinary observations require extraordinary evidence.

— Buzz Aldrin

Exceptional claims, require exceptional evidence.

— Christopher Hitchens

Extraordinary claim requires extraordinary proof.

— Carl Sagan

“...what has the weight of evidence to one person does not necessarily have the weight of evidence to another.”

— Mitch Glaser

“An extraordinary claim requires extraordinary proof. ('On the Extraordinary: An Attempt at Clarification", Zetetic Scholar, Vol. 1, No. 1, p. 11, 1978)”

— Marcello Truzzi

“the weight of evidence ‘cannot convince those who do not wish to believe”

— Alison Weir

“a skeptic's mantra is "extraordinary beliefs require extraordinary evidence.”

— Anonymous

“entrenched disbelief is oddly immune to evidence.”

— Frans de Waal