Authorities, anxious over sectarian violence that has shaken the nation, quickly blamed the blaze on an accidental electrical short.

NPR: 13 Youths Die In Fire Myanmar Police Call Accident

In an electrical short, electricity follows an unintended path.

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Small flames were noted in one of the two incidents reported when gases escaping from the battery were ignited by an electrical short-circuit in the presence of ambient oxygen, but that was all external to the battery case.

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The FAA announcement comes on the same day the National Transportation Safety Board told reporters it had identified the exact battery cell that first short-circuited on a plane in Boston in early January, but still had not determined the root cause of the electrical short.

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Fires caused by short circuits and sub-standard electrical wiring are common in Bangladeshi garment factories, which often have inadequate fire escapes.

BBC: Bangladesh clothes workers die in factory fire

Dr Pouladian-Kari said the parts would instead be used to protect human life against electrical faults such as short circuits, the jury heard.

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For now, though, Crane recognizes that Nest's scheme can provide benefits in the short term, as well as a bridge to a new era where his electrical grid might be as social as Facebook is.

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Each unit can also serve as a source of electrical power for the military, or emergency response, something always in short supply in forward operating positions.

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