On Mon, 2007-06-04 at 00:07 +1000, Tony Smith wrote:
> Years ago (like 25) I saw a science programme about a liquid that would
> solidify when a current passed thru it.  They thought it would make a neat
> brake (vehicle), but I think a clutch or safety cutout would have been a
> better use.
> 
> As usual with these things, it has never been seen since.

I don't know about materials that solidify when current passes through
them, but I do know of materials that change density in the presence of
a magnetic field. Such a material is used in the suspension of the
Corvette to allow tuning of the suspension with the flick of a switch.

TTYL

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