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05 December, 2014

About 18 months ago, Google began working on an advanced risk analysis engine that could figure out just who — or what — was behind an attempt to get through a CAPTCHA screen. The researchers looked at a host of cues. They included what web site the person had come from, where their mouse went on the screen, how long it moved, how steady it was and other cues Google won't divulge.

http://www.smh.com.au/digital-life/digital-life-news/googles-new-captcha-test-to-see-if-youre-a-robot-simply-asks-if-youre-a-robot-20141205-120wj8.html