In MS the damage to myelin exposes channels on the surface of the axon, allowing potassium ions to leak out and thus dissipate the electrical current that carries nerve signals.

FORBES: Two Steps Forward

"The Road" was originally set to come out last year, and in one sense the decision to delay its release was karmically right, since (like " 2012") it addresses the current mood of nerve-jangling anxiety and doom.

CNN: Review: A journey down 'The Road'

Each segment has an electromagnet attached to it, and these are activated by a current that flows from head to tail in more or less the way that a nerve signal flows in a real animal.

ECONOMIST: Robots