This sign is 500 pounds, made of steel, and covered in bulletproof glass to protect from vandals
                                
                                
                                    (Newser) -
                                    Past markers  for  Emmett Till  have been shot at, thrown in the Tallahatchie River, covered in graffiti, and doused in acid. Now, the fourth memorial at a Mississippi site for the black teen tortured and killed murdered in 1955 is in place, and it's been fortified against at...