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I've been studying electrical and magnetic fields for over 4 months and have exam tomorrow
and there's no way a brain could generate them in big quantity (even at small it's not possible)
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What do you think an MRI does Xavier? the currents in a brain produce magnetic fields. Granted they aren't big but Mud brains could produce fields that are much bigger, and shamans are just people who have learned to control their own brainwaves