A central lesson of science is that to understand complex issues (or even simple ones), we must try to free our minds of dogma and to guarantee the freedom to publish, to contradict, and to experiment. Arguments from authority are unacceptable.

Carl Sagan

Carl Sagan

American astronomer, astrophysicist, cosmologist, author

9 November 1934 — 20 December 1996

Billions and Billions

Chapter 14

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Time of publication: August 31, 2011

Length: 244 characters

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