Thanks to recent breakthroughs, the insides of our refrigerators could work very differently in the coming years. The method is based off the magnetocaloric effect, which originated in the 1880s when German physicist Emil Warburg observed that certain metals have special properties in the presence of a magnetic field. This pump then moves heat from the colder environment of a refrigerator to a warmer environment, like your kitchen. This is similar to current refrigeration technology that uses a compressor to move heat, but using magnets could make refrigeration 20 percent more energy efficient.
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