Cornell biologists may have made a breakthrough in understanding why some people are electrosensitive. They report in Nature Communications that humans as well as many other species descended from a type of fish that lived some 500 million years ago which had a "well developed electroreceptive system." A possible implication is that some of us, like sharks and rays, may be able to detect very weak electric fields and perhaps a subset has an electroreceptive system that has gone awry....