Categories Carl Sagan good Carl Sagan | good The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. Post author By Beautiful Quotes Post date December 10, 2022 No Comments on Carl Sagan | good The brain is like a muscle. When it is in use we feel very good. Understanding is joyous. Carl Sagan Tags Carl Sagan, good, ← George Washington | good → Albert Camus | good Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ