Daddy, what is electricity?

I can relate to the father who was walking with his young son. The boy asked, "Daddy, what is electricity?"

         “Well now, I don't really know," said the father. I never knew much about electricity. All I know about it is that it makes things run."

         A little farther on, the boy said, "Daddy, how does gasoline make the automobiles go?"

         The father answered, "Well, I don't know. I don't know much about motors."          Several more questions followed with much the same result; until at last, the boy said, "Gee, I hope you don't mind my asking so many questions."

         "Not at all, son," said his father. "You go right ahead and ask. How else would you learn any thing?”