A ferrofluid (portmanteau of ferromagnetic and fluid) is a liquid that becomes strongly magnetized in the presence of a magnetic field. Ferrofluid was invented in 1963 by NASA's Steve Papell as a liquid rocket fuel that could be drawn toward a pump inlet in a weightless environment by applying a magnetic field.
https://en.wikipedia.org/wiki/Ferrofluid
https://www.youtube.com/watch?v=9wTGKpq3Ugk
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