This first episode of The Literate Caveman introduces The Four Loves by C.S. Lewis.  The premise of the book is that in English people tend to use the words 'like' and 'love' interchangeably, and often incorrectly.  In Greek however, there are at least four different words for love, and they all have different, more precise meanings.  This episodes outlines this, as well as introducing the ideas of 'gift-love' and 'need-love' and how they relate to C.S. Lewis' larger ideas about love.