3Qs: Why Samsung Galaxy Note 7s are igniting and how to deal with the recall

Fed­eral reg­u­la­tors yes­terday announced a formal recall of some 1 mil­lion Sam­sung Galaxy Note 7 smart­phones after reports of the devices over­heating and igniting. North­eastern research pro­fessor K.M. Abraham, an expert on lithium-​​ion bat­tery tech­nology, explains the phe­nom­enon and how to respond to it.