I assume it's the algorithm (not me, of course
), but I often get repeat requests when I'm certain that I responded correctly, and by the same token, I've been successful with what I'm certain were incorrect responses.
I've often wondered what's behind this new algorithm, though. I never found the street signs to be much of a challenge, but the numbers seemed to be a pretty good approach, although I did read that Google had an algorithm that could read them.
Have the bad guys accomplished that, too?