Chain restaurants are where those of diverse socioeconomic statuses may get to interact
                                
                                
                                    (Newser) -
                                    If you were asked to come up with venues that represent a true melting pot of the rich, poor, and everyone in between interacting, you might think of the likes of churches, parks, and post offices. But the  Messenger  reports on a new study out of MIT and California's...