Describe which two events the title "The Sieve and the Sand" refers to, and list what Faber thinks is missing from society as one of them.

The "Sieve and the Sand"  refers to two incidents: one from Montag's childhood and one from the present.  In the incident from his childhood, a cousin challenged Guy Montag to fill a sieve with sand in exchange for a dime.  Of course, the more sand that the child Montag put into the sieve, the more sand fell through the holes in the sieve.  This frustrated Guy, causing him to cry.  The other incident involves Montag's attempts to memorize.  He is trying to commit to memory the Book of Ecclesiastes from the Bible, but the jingle from the advertisement for Denham's Dentrifice that keeps playing while Montag is on the train is interfering and the words to Ecclesiastes fall through his memory just like the sand went through the sieve all those years ago.  Just as he was as a child, Guy Montag is frustrated at his inability to hang onto the words he's trying to memorize.  Guy's modern world counts on this inability to concentrate.  This world he lives in without books has encouraged people to live for the immediate moment; it's a world of sound bites and expediency.  By filling every place with mindless sound such as the advertisement jingle, people can't concentrate and do any serious thinking.  If people can't think, they are much more easily controlled.  This is just where society, and the government in the book, want people. By banning books, people's minds have been turned into sieves unable to hold thought.