Science comes up with a lot of awesome stuff, and you don't need a Ph.D, a secret lab, or government funding to get your hands on
Ferrofluid
Magnetic particles suspended in oil never looked so sexy. That's all a ferrofluid is, and it looks pretty gross until you put it in close proximity to a magnet, at which point it grows spikes all over the place as the fluid flows out along magnetic force lines.
Ferrofluids are found in everything from speakers to hard drives, but it's much more fun to play with when when you've got a puddle of it naked and out in the open.
Price: $40
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