Your brain uses small amounts of electricity to make your muscles move. If you grab a live wire, a much larger amount of electricity flows through your body, so it hits your muscles like a much stronger version of the signals from your brain, causing them to contract as much as they possibly can — and they’ll stay contracted as long as the electricity is there. So the “glue” is that you’d be involuntarily gripping the wire as hard as you can, without being able to relax your hand, and as long as you’re touching it, the electricity keeps flowing.
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