I just read about a very cool fact: If two pieces of metal touch in vacuum (for instance, in space) the stick together and can become permanently welded.
Usually it doesn't happen because any metal that has been in earth's atmosphere has a thin layer of oxide that prevents the effect. Even those that we send to space, since they already been to earth.
More info, as always, at https://secure.wikimedia.org/wikipedia/en/wiki/Cold_welding.
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