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Lucas Davis——Works at the International Organization for Migration, Lives in Geneva, Switzerland.
The iron ore magnetite, also known as lodestone, is a natural permanent magnet. Other permanent magnets can be made by subjecting certain materials to a magnetic force. When the force is removed, these materials retain their own magnetic properties. ... They are made by surrounding certain materials with a coil of wire.read more >>+119962023-04-20 01:17:01
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