Everyone knows the CAPCHA tests on websites where you either have to click on numerous pictures of cars, traffic lights, or bicycles, enter confusing ... that you’re not a robot.

If you’ve signed in to a new or existing Internet account, or set one up, you’ve probably had to check one of those boxes that says “I’m not a robot.” Some of them are a little more ...

For instance, it might display a picture of a cat and ask the user to ... to track the user's movements over the captcha widget, not the whole page. And he argues that captchas are, by their ...