Keep your impedances as low as possible on I/O, and place significant 
impedance between the electronics, and the outside world.
Small caps inside those impedances, to swamp any energy that does get 
through, plus steering diodes to bleed it off to VCC or gnd as 
appropriate.  Build from dissipative materials, conductive may get 
you in worse trouble from the magnetic field pulses when discharges happen.
Tie any unavoidable floating metal to circuit ground through 1k or so 
to limit current.


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