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Science → Inventions and devices → Office supplies and equipment
ANSWERS: 1
  • ptrask
    Some common materials include ferrous metals, ceramics and plastics. There are also more exotic materials including samarium-cobalt, strontium-cobalt and alnico (aluminum, nickel, cobalt). Some of the exotic material magnets can have a magnetic force that is more than a thousand times as strong as the "common" ceramic refrigerator magnet.
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