But the most surprising revelation came when researchers investigated exactly how turtles detect these magnetic fields. By exposing the turtles to oscillating radio frequency fields — which are ...

is a non-invasive biomedical imaging technique that uses a strong oscillating magnetic field to induce endogenous atoms such as hydrogen, or exogenously added contrast agents, to emit radiowaves ...

For the first time, they found that the nuclear spins can act as a pre-amplifier that effectively enhances a coherently oscillating measured magnetic field by at least two orders of magnitude.