Jonathan Bergmueller “We’re going to knock on every door in the city over the next few years.” Mark Killian, chief of the Williamsport Bureau of Fire, is a door-to-door “salesman.” But he is not peddling cheap kitchen knives or cure-all panaceas, and what he’s selling is the importance of preparedness and safety — the smoke detectors are free. Killian and the city fire department are giving away smoke detectors, free of charge, to city residents. The fire department launched its S.A.F.E. (Smoke Alarms for Everyone) initiative on Saturday with the goal of ensuring the detector...