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

"The price we pay for the suppression of doubt is that we can never be sure of anything."

"The Earth is like a tiny, fragile spaceship, and we are its crew."

"The notion that the pre-Copernican Earth was flat is a common misconception."

"The universe is not required to be in perfect harmony with human ambition."