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May 5, 2016 at 16:32 comment added alexw It's worth noting that human brains do actually put out a faint but detectable magnetic field, which varies with neural activity. In humans, it is so weak that it is overwhelmed by technological sources and even the Earth's magnetic field. However, one could imagine a species that evolves a specialized amplifying organ for magnetic transmission, in addition to a receiving organ. Again, there would need to be some adaptive advantage to communicating via EM versus sound waves, as we do now.
Mar 20, 2015 at 6:44 history answered Mark Micallef CC BY-SA 3.0