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 ...

So, how does Captcha know that I’m not a robot? This brings us to the previous question of how CAPTCHAs can still work today, even if they’re generally used less frequently than in the past.

Captcha tests have been around for years, but they're getting more difficult. Experts say the "I'm not a robot" tests should evolve to keep up with advancing tech. But some internet users are sick ...