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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

Carl Sagan

Writing is the greatest of human inventions, binding together people, citizens of distant epochs, who never knew one another.
CARL SAGAN

Blind Citizen Distant Greatness Human Invention People Togetherness Writing
When we look up at night and view the stars, everything we see is shinning because of distant nuclear fusion.
CARL SAGAN

Distant Fusion Look Night Nuclear Science Shine Stars
Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.
CARL SAGAN

Cosmic Disagree Finding Galaxy Human Love Mercy Perspective Precious
I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves.
CARL SAGAN

Assume Come Consideration Danger Extreme Ourselves Outside Problem Solution
Writing is the greatest of human inventions, binding together people, citizens of distant epochs, who never knew one another.
CARL SAGAN

Blind Citizen Distant Greatness Human Invention People Togetherness Writing
Arguments from authority carry little weight, authorities have made mistakes in the past. They will do so again in the future. Perhaps a better way to say it is that in science there are no authorities; at most, there are experts.
CARL SAGAN

Argument Authority Expert Future Mistake Past Weight
The price we pay for anticipation of the future is anxiety about it.
CARL SAGAN

Anticipation Anxiety Future Pay Price
I’ve always thought an agnostic is an atheist without the courage of his convictions.
CARL SAGAN

Atheist Conviction Courage
If it can be destroyed by the truth, it deserves to be destroyed by the truth.
CARL SAGAN

Deserve Destroy Justice Science Truth
If I finish a book a week, I will read only a few thousand books in my lifetime, about a tenth of a percent of the contents of the greatest libraries of our time. The trick is to know which books to read.
CARL SAGAN

Book Content Finish Library Lifetime Percent Reading Time Trick Week
The Earth is the only world known so far to harbor life.
CARL SAGAN

Earth Harbor Life
Exploration is in our nature. We began as wanderers, and we are wanderers still. We have lingered long enough on the shores of the cosmic ocean. We are ready at last to set sail for the stars.
CARL SAGAN

Cosmic Enough Explore Investigation Nature Ocean Ready Sail Shore Stars Wander
The absence of evidence is not evidence of absence.
CARL SAGAN

Absence Evidence One Liner
We can’t help it. Life looks for life.
CARL SAGAN

Help Life Look Science
Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact.
CARL SAGAN

Beat Born Enthusiam Kids Natural Science Scientist Start System Wonder
There are as many atoms in one molecule of DNA as there are stars in a typical galaxy.
CARL SAGAN

Atom DNA Galaxy Molecule Science Stars Typical

The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.

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Popular Authors

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