Biomagnetism is present in all living organisms because of their interaction with the Earth’s magnetic field. Thanks to a discovery by the 16-th century English astronomer and physicist William Gilbert, we know that the Earth is a massive magnet, due to the circling electric currents in its liquid outer core. It is composed of highly conductive molten iron, nickel and other minerals; the Earth’s rotation acts as a generator spinning the substances, resulting in attractive and repulsive forces.
The Earth’s magnetic field, although invisible to the human eye, can be called a true planetary defense shield that has an invaluable impact on the survival of all life forms. If it did not protect the Earth from the deadly and high-energy cosmic rays that are continually emitted by the sun, the planet’s entire ecosystem would cease to exist.