From Rorschach tests to trigonometry, this 48-level gauntlet is the most infuriating test of your humanity yet. Can you ...

CAPTCHAs are those now ubiquitous challenges you encounter to prove that you’re a human and not a bot when you go to log in to many websites. As a computer scientist, I see CAPTCHAs as an effective ...

Bots have got a lot to answer for. They now make up over half of all internet traffic, and while some, such as Google’s web crawlers and fetchers, have legitimate purposes, nearly two-fifths are ...