“Absence of evidence is not evidence of absence.”

— Carl Sagan, The Dragons of Eden, 1977, Introduction

About Carl Sagan

1934 – 1996

American astronomer and science communicator, author and presenter of "Cosmos".

“We make our world significant by the courage of our questions and by the depth of our answers.”

“Books are key to understanding the world and participating in a democratic society.”

“Imagination will often carry us to worlds that never were. But without it we go nowhere.”

“Let whatever appears to be the best be to you an inviolable law.”

“Lord, what fools these mortals be!”

“All that glisters is not gold.”

“Uneasy lies the head that wears a crown.”

“And one man in his time plays many parts.”

“Give every man thy ear, but few thy voice.”