All of the rocky and metallic material we stand on, the iron in our blood, the calcium in our teeth, the carbon in our genes were produced billions of years ago in the interior of a red giant star. We are made of star stuff.
Carl SaganAll inquires carry with them some element of risk. There is no guarantee that the universe will conform to our predispositions.
Carl SaganFor all our failings, despite our limitations and fallibilities, we humans are capable of greatness.
Carl SaganWe are not smart enough to decide which pieces of knowledge are permissible and which are not.
Carl Sagan