terrorism,Boston Marathon, sewers, rats, bombs, bombing, race,boston marathon

man,men,male,males,manhole,manholes,hole,holes,burrow,burrows,cover,covers,street,streets,warren,warrens,rabbit,rabbits,groundhog,groundhogs,burrowing,animal,animals,sewer,sewers,water,gas,repair,repairs,sociology,sociological,behavior,behaviors