The Occupy Wall Street movement has put out a call for sympathetic parents to bring their children to stay overnight in Zuccotti Park tonight, which lead us to thinking: How, exactly, should a concerned parent explain the Occupy Wall Street movement to someone who thinks “class warfare” refers to the struggle between Math and Reading? To help with this dilemma, The Observer has put together a little book that should be bedtime reading under the floodlights tonight when you tuck little Zeldy and Leopold under their tarps.