Ferrofluid is wacky water with magnetic personality; you can use it for many neat tricks, like this
magic-like rotating field, or a make a
sculpture with strong magnet. There is also a video on
how to make a liquefy magnet, an interesting project which Singapore school's boring science class would not let you do it. (
Link)
Do check out the full text description on how to make liquid magnets
here.
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