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Ferrofluids
A liquid with suspension of magnetic particles allowing the liquid to react to magnetic fields. NASA developed this for use in controlling fluid fuels in zero gravity. It has many other uses including electronics, mechanical engineering applications including dampers, medical treatments, and others. The link above is to a decent video of the behavior of ferrofluids, if you search on youtube or google there are a lot of other ones out there that are good to look at.
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