January 26, 2014 7:04 am Walls come tumbling down Somerville latest Mass.-backed plan to replace elevated expressways with boulevards, parkways US & World Videos 1:32 Amber Alert for 2 NH girls canceled, father in custody 2:53 Latest on Lewiston, Maine shootings 2:01 Local researchers looking to turn plastic into fuel 1:45 Gov. Healey to sign bottle ban order for state agencies 2:41 Leominster students return to school after floods