• Carl Sagan The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
    Carl Sagan
    American astronomer, cosmologist, astrophysicist and author 1934-1996
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Carl Sagan - The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. by : Carl Sagan

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forest The brain is like a muscle. When it is in use we feel very good. Understanding is joyous.
- Carl Sagan Greatest-Quotations.com