"A ferrofluid (from the Latin ferrum, meaning iron) is a liquid which becomes strongly polarized in the presence of a magnetic field. It is a colloidal mixture comprising extremely small magnetic particles suspended in a liquid. The particles are coated with a soap or detergent to prevent them from clumping together."
Basically it's a magical black liquid that makes a lot of spikies in response to magnetic stimuli and is amazing to watch.
UPDATE: I just got an email from a very reliable metal expert, and he has something he wants to say about ferrofluids.
From: Magneto@menwithmetaldongs.com
[mailto:nothingforx@sexybloggers.com]
Sent: Thurs 2008-05-02 12:58
To: Nothing For X
Subject: Ferrofluids
Dear Nothing For X,
I really want to stick my metal rod in that ferrofluid.
Your fan,
Magneto
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