Basically, a ferrofluid is a magnetic liquid. It's really awesome to watch. I found a place where you can buy it here, toward the bottom of the page, for about $0.75 per ml.Amazing Ferrofluid - Funny bloopers are a click away
Whoa, that is weird! I thought the black stuff (the liquid) looked almost animated at first... I wonder if it's really for real...? But then again, why not? Magnetic solid particles act that way, why not "liquid"?
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