Liquid Material becomes Solid in Magnetic Field
FortKnox writes: "Cool cool stuff, here. This Y! article talks of a substance that can morph between liquid and solid by the presence of a magnetic field. Now this is something you can make into a cool toy!"
The weight of magnets is problematic for any space-based applications that have to be launched, but pretty cool earth-bound applications to start with.
Of course, for those who are looking for the pr0n angle: