Original Source: <a href="http://googleonlinesecurity.blogspot.com/2014/12/are-you-robot-introducing-no-captcha.html" rel="nofollow">http://googleonlinesecurity.blogspot.com/2014/12/are-you-rob...</a><p>Cool that it now takes into account who a "normal" user might be for a particular site before challenging. More Humble Bundle traffic is let through without CAPTCHA, than Wordpress traffic.