For years, Google has used the simple system of distorted text CAPTCHAs to determine whether users were humans or robots. Robots used to be unable to decipher distorted text, so they always failed the ...

The genre of tests that screens for bots by demanding users type out letters, or click on all the images of chimneys, has ...

At an artificial intelligence summit in Geneva, a humanoid robot named Captcha stole the show with its sharp wit and ...