Application: Neurons and Electricity

Our body is run by electrical signals. 

How big are they?  http://en.wikipedia.org/wiki/Action_potential

The University of Utah is a world leader in recording and stimulation of individual neurons.  TheUtah Electrode Array, invented by Dr. Richard Norman, is being used tohelp blind people see, deaf people hear, injured peopleregain the use of their limbs, or artificial limbs, and more.