When men first encountered sparks, as when a lightning bolt incinerated their neighbors, they had no idea of their nature or cause, only that they arrived with a violence unlike anything else in the world. Historians often place humankind’s initial awareness of the distinct character of electrical phenomena in ancient Greece, with a gentleman named Thales, who discovered that by rubbing amber he could attract to it small bits of things, like beard hair and lint. The Greek word for amber was elektron.
