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

less than 1 minute read

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.

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.

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

- Carl Sagan

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