MRI of a knee. MRIs employ powerful magnets which produce a strong magnetic field that forces protons in the body to align with that field. When a radiofrequency current is then pulsed through the patient, the protons are stimulated, and spin out of equilibrium, straining against the pull of the magnetic field.
Noun. 1. aestivation - (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period. estivation. zoological science, zoology-the branch of biology that studies animals.
Our devices do this in order to conserve energy when we aren't using them. Some animas in the wild 'go dark' in a similar way when they're trying to conserve energy. Only when they do it, it's called estivation. Estivation, which is a form of dormancy, is about trying to minimize energy needs during tough times.