Have you heard of ferrofluid? Ferrofluids are colloidal liquids made of nanoscale ferromagnetic, or ferrimagnetic, particles suspended in a carrier fluid (usually an organic solvent or water), and they become strongly magnetized in the presence of a magnetic field.
There's loads of videos of these on YouTube, but I like this one in particular. Fascinating stuff.
It's also called magneto hydrodynamics, and it CAN propel a ship... :-)
Toys we get to play with deep in the research laboratories and call it work.
I think I'm going to get some and play with it, with my 3 yr old daughter.
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