Yet another recent discovery also hints at potential untapped human powers. Apparently, we carry a protein called cryptochrome in our retinas that detects the Earth’s magnetic fields — at least when that protein is implanted in the eyes of fruit flies. It’s well known that cryptochrome helps many creatures, including birds, innately sense (actually see) magnetic fields … kind of like using a built-in GPS to navigate on long migratory journeys. But whether we humans use our internal compasses — or could learn to — is still open to debate. In the meantime, better hang onto that GPS.