Carl Sagan -The brain is like a muscle. When it is in...

“ 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. “

“ 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. “

“ 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. “

“ 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. “

“ 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. “

“ 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. “