"I said to him maybe he's taken his finger off the pulse because he didn't know what was going on!"

CNN: November 5, 2011 -- Updated 2121 GMT (0521 HKT)

Any electrical or electronic device - including the grid's transformers - not shielded against this pulse would be, at best, taken temporarily off-line.

CENTERFORSECURITYPOLICY: EMP and you

Here at CES 2013 the company is showing off a concept smartwatch that uses an ECG sensor to measure the pulse in your wrist.

ENGADGET: Toshiba's concept smartwatch reads your pulse, pulls maps from your phone