La prueba de ausencia no es prueba de ausencia - Carl Sagan

"If it can be destroyed by the truth, it deserves to be destroyed by the truth."

"The way to find out about our place in the universe is by examining the universe and by examining ourselves - without preconceptions, with as unbiased a mind as we can muster."

"Extraordinary claims require extraordinary evidence."

"Science is a way of thinking much more than it is a body of knowledge."

"The nuclear arms race is like two sworn enemies standing waist deep in gasoline, one with three matches, the other with five."