Humans have a magnetic sensor in our eyes, but can we detect magnetic fields?

Many birds have a compass in their eyes. Their retinas are loaded with a protein called cryptochrome, which is sensitive to the Earth’s magnetic fields. It’s possible that the birds can literally see these fields, overlaid on top of their normal vision. This remarkable sense allows them to keep their bearings when no other landmarks … Continue reading Humans have a magnetic sensor in our eyes, but can we detect magnetic fields?