The article entitled "Basics of Thermoelectric Effect with Magnetic Readout", by Johann H. Hinken and Yury Tavrin, shows a schematic diagram of the thermoelectric eddy current and associated electromagnetic field which are produced whenever a thermal gradient is maintained across an element* of one electrically conductive material which is completely enclosed within another dissimilar conductor. See: http://www.hs-magdeburg.de/fachbereiche/f-iwid/ET/Personen/Hinken/forsch... (Figure d is particularly instructive.) The metal amalgams used for filling cavities in teeth comprise a great many elements* of one particular electrically conductive material (unreacted dental alloy) which are all enclosed within a matrix of a dissimilar electrically conductive material (dental alloy mixed in solution with mercury). See: http://www.bookbootusers.co.uk/setting.htm If we can assume that the materials used in restorative dentistry are not exempt from the laws of nature, then we should expect that when a temperature gradient is established across a piece of this material thermoelectric eddy currents and their associated local electromagnetic disturbances will be induced around each of the elements* of "unreacted alloy". The material should "come alive" with thermoelectric eddy currents. Does anyone know of any experiment which might be employed in order to try and detect this thermoelectric activity inside the material from a position just outside its surface? And does anyone know if the electromagnetic effect produced by the eddy currents would be strong enough to have an influence on neurological tissue in the vicinity of a metal dental filling in someone's mouth? Keith P Walsh * in this context I am using the word "element" to mean "piece", and not in the sense of the term "chemical element".