Hacker News new | past | comments | ask | show | jobs | submit | from login

Are You a Metalhead or a Bot? – Metal Captchas (heavygifts.com) 1 point by GotAnyMegadeth on July 28, 2015 | past Metal Captcha (heavygifts.com) 193 points by v4n4d1s on July 28, 2015 | past | 79 comments

Join us for AI Startup School this June 16-17 in San Francisco! Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact Search: