Ferrofluid

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It's magnetic particles suspended in mineral oil. Put it in a petri dish and put a strong magnet undertneath and a combination of the magnetic fields and the surface tension of the mineral oil causes it to form these crazy spikes. Without the magnet it resembles motor oil. You can buy it on ebay with a rare-earth magnet for $15.
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Comments

jesse parker said…
you should put the dish on top of a speaker voice coil.. Then play some music..
1:20 PM, June 17, 2007
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