One of nature’s most dramatic mysteries—the migration of birds, turtle, salmon and other animals—depends on iron magnets. The bodies of some animals contain minute deposits of magnetite that are sensory navigators. Far reaching in scope, Iron, Nature’s Universal Element also looks at global issues including iron’s power over the earth’s oceans, vegetation, and populations; and the low-protein diets that lead to long-term cognitive damage in iron-deficient children in poor countries.

The Bahá’í Faith is one of the fastest growing, but least studied, of the world’s religions. Adherents view themselves as united by a universal belief that transcends national boundaries. Michael McMullen examines how the Bahá’í develop and maintain this global identity. Taking the Bahá’í community in Atlanta, Georgia, as a case in point, his book is the first to comprehensively examine the tenets of this little-understood faith.