We are the first species to have taken our evolution into our own hands. — Carl Sagan Copy Share Image
“The secrets of evolution, are time and death. There's an unbroken thread that stretches from those first cells to us.” — Carl Sagan Copy Share Image
I've written a number of books that have to do with the evolution of humans, human intelligence, human emotions. — Carl Sagan Copy Share Image
A new consciousness is developing which sees the earth as a single organism and recognizes that an organism at war with itself… — Carl Sagan Copy Share Image
Thus the recent rapid evolution of human intelligence is not only the cause of but also the only conceivable solution to the… — Carl Sagan Copy Share Image
“The same few dozen organic molecules are used over and over again in biology for the widest variety of functions.” — Carl Sagan Copy Share Image
We are the representatives of the cosmos; we are an example of what hydrogen atoms can do, given 15 billion years of… — Carl Sagan Copy Share Image
“Those are some of the things that molecules do, given four billion years of evolution” — Carl Sagan Copy Share Image
The secrets of evolution are death and time-the deaths of enormous numbers of lifeforms that were imperfectly adapted to the environment; and… — Carl Sagan Copy Share Image
“The entire evolutionary record on our planet, particularly the record contained in fossil endocasts, illustrates a progressive tendency toward intelligence. There is… — Carl Sagan Copy Share Image
“Perhaps if one less dragonfly had drowned in the Carboniferous swamps, the intelligent organisms on our planet today would have feathers and… — Carl Sagan Copy Share Image
“If artificial selection can make such major changes in so short a period of time, what must natural selection, working over billions… — Carl Sagan Copy Share Image
We are at a crossroads in human history. Never before has there been a moment so simultaneously perilous and promising. We are… — Carl Sagan Copy Share Image
“If the Earth were as old as a person, a typical organism would be born, live and die in a sliver of… — Carl Sagan Copy Share Image
“I am a collection of water, calcium and organic molecules called Carl Sagan. You are a collection of almost identical molecules with… — Carl Sagan Copy Share Image
“In less than ten thousand years, domestication has increased the weight of wool grown by sheep from less than one kilogram of… — Carl Sagan Copy Share Image
A new consciousness is developing which sees the earth as a single organism and recognizes that an organism at war with itself… — Carl Sagan Copy Share Image
“Naive Darwinists, including many capitalists, have self-servingly argued that oppression of the weak and the poor is a justified application of natural… — Carl Sagan Copy Share Image
The beauty of a living thing is not the atoms that go into it, but the way those atoms are put together.… — Carl Sagan Copy Share Image
“We inhabit a universe where atoms are made in the centers of stars; where each second a thousand suns are born; where… — Carl Sagan Copy Share Image
It is sometimes said that scientists are unromantic, that their passion to figure out robs the world of beauty and mystery. But is it… — Carl Sagan Copy Share
The prediction of nuclear winter is drawn not, of course, from any direct experience with the consequences of global nuclear war, but rather from… — Carl Sagan Copy Share
The suppression of uncomfortable ideas may be common in religion or in politics, but it is not the path to knowledge; it has no… — Carl Sagan Copy Share
“Telepathy’ literally means to feel at a distance, just as ‘telephone’ is to hear at a distance and ‘television’ is to see at a… — Carl Sagan Copy Share
“On the scale of worlds—to say nothing of stars or galaxies—humans are inconsequential, a thin film of life on an obscure and solitary lump… — Carl Sagan Copy Share
Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies,… — Carl Sagan Copy Share
In our time, we have sifted the sands of Mars, we have established a presence there, we have fulfilled a century of dreams! — Carl Sagan Copy Share
“[ When a religious couple wrote to Sagan about fulfilled prophecies, he wrote back in May 1996 :] If ‘fulfilled prophecy’ is your criterion,… — Carl Sagan Copy Share
“Books permit us to voyage through time, to tap the wisdom of our ancestors. The library connects us with the insight and knowledge, painfully… — Carl Sagan Copy Share
We live on a hunk of rock and metal that circles a humdrum star that is one of 400 billion other stars that make… — Carl Sagan Copy Share
A tiny blue dot set in a sunbeam. Here it is. That's where we live. That's home. We humans are one species and this… — Carl Sagan Copy Share
Any sufficiently crisp question can be answered by a single binary digit-0 or 1, yes or no. — Carl Sagan Copy Share
Humans — who enslave, castrate, experiment on, and fillet other animals — have had an understandable penchant for pretending animals do not feel pain.… — Carl Sagan Copy Share
