As a series of goopy platforms climb down a
But this isn't 1990's video-game graphics, it's real life. The GIF shows a demonstration of ferrofluid, a suspension of nanosize magnetic particles in oil. The magnetic particles are small and coated in a surfactant, which is a substance like soap that helps to keep the particles evenly distributed throughout the fluid, even when they're put next to a strong magnet, said Brandon Jackson, a doctoral candidate in mechanical engineering at Michigan Technological University, who has studied applications for ferrofluids.
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