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Few things in this world can be more annoying than running out of battery. It seems like your cell phone has made the application of Murphy's Law its raison d'etre. It dies right before you are expecting that important call from a client. It dies the day that your kids are sick. It always seems to die when you have just left the spot that had an easily accessible outlet.

Large-scale emergencies, such as bombings and plane crashes, trigger a sharp spike in the number of phone calls and text messages sent by eyewitnesses in the vicinity of the disaster, according to a research study by network scientists at Northeastern University.