....similar to a human
[url=http://www.canada.com/mobile/iphone/story.html?id=7628440]apparently it can also learn[/url]. Not as good as an actual human brain but its a start.
[Edited on 11.30.2012 11:01 AM PST]
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Creating blocks for an AI takeover isn't too hard. You can literally hard-code into the machinery itself, which cannot be rewritten without removing or replacing that machinery. hardcode a set of ethics, as well as the rule that it can never replace it's own or another robot's "heads" with any modified form, nor can it create a modified form.