But that's cause its liquid metal. Blah. The more sequels Terminator comes up with, the more conflicting information seems to turn up.
Now with Sarah Connor Chronicles its getting ridiculous. Com-Tech sent some people back into the past to build a radioactive isotope gun and a crude time machine to help Cameron and the Connors escape.
*throws hands up in the air*
So that sorta conflicts UN_MARINE's point that it was hard to do and only Skynet knows how.