Tags: toroid*

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  1. 2007-09-11 Tags: , by klotz
  2. Good for both early grades and grades 4-5, a variation on the old "electromagnet nail" and uses a Slinky to boot
    2007-08-28 Tags: , , by klotz
  3. 2007-01-22 Tags: , by klotz
  4. 2007-01-22 Tags: , by klotz

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