First, you had to fill in a captcha form with a few words or numbers to prove that you were a real person. Then, you could just click a box indicating that you were not a robot. Now, such barriers will be a largely invisible because Google can tell who you are (or at least what you are) from your browsing behavior. (I consider it a point of pride that I’m regularly mistaken for a robot online.)
+ Take a look at the robot that can fold your laundry. Once we create a robot that refuses to fold your laundry, we’ll have reached the singularity.