How to Survive an EMP or Superworm Attack

Via Slate Magazine:

Bill Gates and Steve Jobs could probably tell you terrific stories about where they were and what they were doing when they realized the true implications of the electronic age. But you'd get a somewhat more interesting account from any aging electrician in Hawaii: That's because one evening there in July 1962, 100 burglar alarms suddenly sounded and 300 street lights suddenly blinked out for no apparent reason. All over the region, phones, radios, and televisions went dead without warning.

The cause, it turned out, was 800 miles due west and 250 miles up in the air: A 1.4 megaton nuclear weapon had been detonated some 1.32 million feet above tiny Johnston Island in the Pacific.