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How often do captchas appear?

I am using SO for more than 9 months and suddenly today I have seen two captchas back to back. Why is it happening so suddenly? How can I stop this from happening, or how many times do I need to prove that I am human?

  • Were you making several quick edits in a row perhaps? (And I assume that you are human, right?) – Bart Jun 18 '12 at 10:04
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    Are you human? Answer carefully, because a robot posing as a human would surely say yes. – David Jun 18 '12 at 10:08
  • Think of it as a random stop and search. It doesn't always make sense, but there's nothing you can do about it really... – Pekka supports GoFundMonica Jun 18 '12 at 10:22
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    You probably pasted code then submitted right away - been there done that even with more than 10K rep it can happen. – Shadow The Princess Wizard Jun 18 '12 at 10:26

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