Physics, Superconductivity, Magnetism, Materials Science.
audio speakers, cars, and compasses, which are what people used together with a map to get around before we all had GPS. An MRI machine is the most likely place that you will encounter superconductors for the moment. By Jan Ainali (Own work) [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)],