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Stack Overflow uses Recaptcha to dissuade bots. Recaptcha provides an audio test for users with difficulty reading.

Accessibility. CAPTCHAs must be accessible. CAPTCHAs based solely on reading text — or other visual-perception tasks — prevent visually impaired users from accessing the protected resource. Such CAPTCHAs may make a site incompatible with Section 508 in the United States. Any implementation of a CAPTCHA should allow blind users to get around the barrier, for example, by permitting users to opt for an audio CAPTCHA

Type what you hear

However, try one out http://www.google.com/recaptcha/learnmore or http://stackoverflow.com/captcha. They are impossible! Not merely difficult— every single one is impossible! Google (who develop Recaptcha) are delusional to think this is accessible.

This is what it played me: http://picosong.com/w6Fs/

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migrated from stackoverflow.com Aug 8 '12 at 13:42

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10  
That specific audio captcha really is absurd... –  Lix Aug 8 '12 at 14:26
16  
@Lix: I believe kids these days call that "Dubbed Stepping". –  user7116 Aug 8 '12 at 14:53
11  
I listened to three of them at the linked site, and they are all just as nonsensical as the one at picosong. They are, indeed, impossible. What is going on there? –  Ernest Friedman-Hill Aug 8 '12 at 15:25
4  
wow... no exaggeration there. It sounds like 8 separate audio files are playing at once. Just terrible! –  Ben D Aug 8 '12 at 15:28
3  
Maybe it's the other way round? You're human as long as you find this impossible. @sixlettervariables "dubbed stepping", priceless. –  Tom Aug 8 '12 at 15:31
3  
Related: meta.stackexchange.com/questions/75965/… –  Anna Lear Aug 8 '12 at 17:01
1  
Since we just pull these from Google, not sure that there's anything we can do about the quality and legibility issues. –  Anna Lear Aug 8 '12 at 17:02
    
Wasn't there this big story about how someone "broke" reCAPTCHA using the audio option? I'm pretty sure the audio CAPTCHAs used to be much easier. –  lunboks Aug 8 '12 at 17:24
    
I must disagree. I find them to be solvable on the first to third try. –  hexafraction Aug 13 '12 at 14:07
    
@ObsessiveFoss well done. I'm curious if I've been unlucky or you're a better listener. Could you post a copy of a problem you can solve, and separately (maybe on pastebin) the solution ? –  Colonel Panic Aug 13 '12 at 14:15
    
@ColonelPanic I didn't realize that this question referred to audio! Silly me... or you still want text captchas? –  hexafraction Aug 13 '12 at 14:42
2  
Nice try, robot. –  Anish Gupta Aug 14 '12 at 11:20
1  
@sixlettervariables "I'm sorry, the drop?" –  casperOne Mar 13 '13 at 1:25
    
If you want to get this changes, I highly recommend retagging your question to "feature-request" and not "discussion." Or even better, contact SE directly. I think this question needs to get more attention. –  Annonomus Penguin Aug 1 '13 at 14:37

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