Carl Sagan Quotes: 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. (Carl Sagan)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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