Abstract
We live in an electromagnetic world, from the chemical bonds that hold us together to the large-scale, powerful effects of thunderstorms and solar flares. Human understanding of electricity began during a time of fascination with and fear of unexplained natural phenomena such as the aurora borealis and lightning. Hundreds of years ago, the earth's magnetic field first became a useful tool for explorers, yet even today, there is no similarly useful large-scale map of the earth's electric field. Indeed, while the earth's magnetic field lines are continuous and penetrate even the depths of the earth, electric fields begin and end with electric charges, which can be anywhere.
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