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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. | Carl Sagan quote HD Wallpaper

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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. | Carl Sagan quote HD Wallpaper
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The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. (Carl Sagan)
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