Advances in medicine and agriculture have saved vastly more lives than have been lost in all the wars in history.
Carl SaganThat we can now think of no mechanism for astrology is relevant but unconvincing. No mechanism was known, for example, for continental drift when it was proposed by Wegener. Nevertheless, we see that Wegener was right, and those who objected on the grounds of unavailable mechanism were wrong.
Carl SaganThe simplest thought, like the concept of the number one, has an elaborate logical underpinning.
Carl SaganIn science it often happens that scientists say, "You know that's a really good argument; my position is mistaken..."
Carl Sagan