A lot of people are familar with these already, but the Creative Commons photos on Wikipedia are just too impressive not to share. The ability to visualize the otherwise invisible:
"Ferrofluids are tiny iron particles covered with a liquid coating, also surfactant that are then added to water or oil, which gives them their liquid properties. Ferrofluids are colloidal suspensions -- materials with properties of more than one state of matter. In this case, the two states of matter are the solid metal and liquid it is in."
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