Is it possible for a liquid-like metal which can change forms, like
in the movie Terminator 2, to exist.
The only metal we know of that is a liquid at room temperature
is mercury. Gallium is a liquid at slightly higher temperatures.
There are certain alloys that can "remember" different
shapes and switch between them under certain conditions,
but it is all very limited so far. But of course we have not
really gone very far in investigating what might be possible
by combining the complexity of biological systems with
the metallic state - it could be something like what you
saw in the movie is possible, but we sure do not know of
anything at all like it yet.
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Update: June 2012