By adding a guide wire to the tip of a standard IV catheter, Amir Belson invented an IV that won't poke vein walls by accident, a problem that can cost hospitals thousands of dollars a week.

He had to act. When Hensley hauled the chair away, Jack grabbed the live wire above him and shoved the still-sparking tip against Hensley's left arm.

A hearing aid careful not to break the wire, don't break the headset microphone, don't poke with a small screwdriver tip and hard.