I just got prompted by captcha to enter in the pi symbol. Not really possible on any keyboard I've seen. Could be an issue with the new site.

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    On a Mac with the French Canadian - CSA keyboard layout it's alt+i. – zneak Sep 5 '10 at 19:35
  • I just got prompted again to type what seems to be a non Alphanumeric character – goodguys_activate Sep 5 '10 at 19:56
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    Sure it wasn't a n? – TheLQ Sep 6 '10 at 3:09
  • reCAPTCHA Tip: Type the shortest word you can read and type, for the other word try to type something as close as possible. You probably could have typed PI or something similar. Even if it's completely unreadable or you are short on time just typing random characters let you through... – Tamara Wijsman Sep 9 '10 at 16:31
  • @zneak, on american mac keyboards it is alt+p. On the PC you hold alt+227 (numpad) I think. – Stephen Furlani Dec 24 '10 at 20:37

I'd recommend reading up on reCAPTCHA.

TLDR: reCAPTCHA is a system that uses captcha strings to parse books that its OCR can't read. You are presented with 2 words- one is a control word that reCAPTCHA knows- the other is a word is hasn't yet determined to sufficient accuracy. So, if you get one word you can read and one you can't, just take your best stab at typing the unreadable one, since it's probably not the control word.

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    Or you could hit the button that gives you a new captcha. – bdonlan Sep 9 '10 at 15:24
  • hahaha, so what you're saying then, is that reCAPTCHA is basically crowd-sourcing their text-detection algorithm as an anti-spam service? They get paid twice for the same thing? win. – Stephen Furlani Dec 24 '10 at 20:35
  • Well, reCAPTCHA is free to use as a CAPTCHA- I don't know whether they charge the people using it for OCR. Actually reading about it now, it looks like Google bought the system and is using it to digitize the NY Times, so I don't think they're charging anyone. – Fishtoaster Dec 24 '10 at 21:18

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