I can't quite understand why this occurs. When a person is standing on insulating stool, and holds a large metallic sphere, which is charged with generator, why is it safe for him to do this? Why is it unsafe for another person to touch the sphere after it has been charged? My guess is that the person standing on the stool is safe because the charge is contained in the sphere because it cannot pass through him to the ground (because of the insulating stool). However, charge can pass through the person standing on the ground because he is a conductor. My question is, would it still be unsafe if the other person stood on an insulating stool and then touched the charged sphere?