On Wednesday, Google announced that many of its “Captchas”the squiggled text tests designed to weed out automated spambots will be reduced to nothing more than a single checkbox next to the statement “I’m not a robot.” No more typing in distorted words or numbers; Google says it can, in many cases, tell the difference between a person or an automated program simply by tracking clues that don’t involve any user interaction.
Read more at
http://www.accessibilitynewsinternational.com/google-can-now-tell-you%c2%92re-not-a-robot-with-just-one-click/