The Magnet Tube Magnetic Field Viewer from ThinkGeek is essentially "a sealed plastic tube filled with iron filings and a tunnel where the Alnico magnet fits in -- give the tube a shake and the iron filings collect and connect, showing the arcs of the magnetic fields." Click here for first picture in gallery.
This is a great little science fair-y experiment and also an awesome desk toy. 'Cause you can slide the magnetic back and forth and make the iron filings dance. It's a scientific hula.[via ThinkGeek]
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[Source: Tech Blog]
