Abstract

This book joins a small number of efforts in the last decade to present the complex scientific issues of geomagnetism to a broader, semi-technical audience. The author approaches this goal more closely than most scientists and science writers. He specifically eschews mathematical equations knowing that even one equation leads some readers to give up trying. He offers instead a mix of description and story-telling, the former directed at phenomena and procedures, the latter drawn mostly from personal experience.As Merrill notes, his wife insisted that he “explain the material in a way she could understand it” (vii). A virtue of this is an enforced candor often obscured by mathematics, even in semi-popular accounts. This is most clear in addressing fundamental questions, such as when he asks what produces the magnetic field of magnets. In a paragraph that begins with a simple bar magnet, the author successively halves the magnet until he has only an electron remaining. This he calls a po