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There's always the old "What Obejects are Conductive?" Get a battery (the big lantern batteries are best), attach a wire from the negative lead* to a lightbulb. Run a second wire from the bulb to the other lead, but cut it. Wrap the two cut ends of the wire around a couple of nails and space the nails a bit apart. Then take different objects, touch them to both nails and see which ones light the light.
*[size=1]I think that's the right way to do it safely, you'll want to double check that though[size]
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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