Dr. Helen Fisher has written a new book on love called Why Him Why Her.  It explores why people fall in love.  But not why people fall in love as such.  Rather, why do people fall in love with someone in particular, as opposed to another one.  Thus, Why him? or Why Her?  When she was first asked this question, Dr. Fisher did not know.  But then she researched it, and came up with her new book.  The answer is rather stilted (as is her writing).  She divides people into  four personality types. Sound simplisitic?  It is.  Whenever science tries to understand something that is outside the reach of the mechanical universe, it falls on its face.  That is what has happened to Dr. Fisher.  If you want to know what love is, read the French.  They know.  They feel.  The are.  The love.