An gano kayan aikin ƙarfe na magnetite na dogon lokaci. A cikin juzu'i tara na littafin Lu's spring and Autumn Annals, akwai wata magana: "Idan kuna da kirki don jawo hankalin baƙin ƙarfe, kuna iya kaiwa gare shi." A lokacin, mutane suna kiran "magnetism" a matsayin "alheri". Ta...
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