Google's latest version of their reCAPTCHA bot-catching utility is invisible. It resides on a website and decides if you're a human or a bot. The only time you'll know if it's there is if it ...

Google’s reCAPTCHA turns “invisible,” will separate bots from people without challenges Google says it can separate man from machine without any tricky tests or checkboxes.

Google has acquired reCAPTCHA, an open source technology that provides CAPTCHAs to prevent spam and fraud. Captchas are those security questions you find on Web sites that require you to decipher ...