One of the comics I read requires you to solve a simple calculus problem before ... | Hacker News

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lotharbot on July 24, 2012 | parent | context | favorite | on: Show HN: Hacker News Comments

One of the comics I read requires you to solve a simple calculus problem before you can comment, as a pseudo-captcha.

http://spikedmath.com/

sigkill on July 24, 2012 [–]

That's cool. By the way, I got mine as well. It's the Quantum bit service.

Link - http://random.irb.hr/signup.php

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