These tests are total BS, I have never needed more than one question to determine human vs bot: "3OOO + 1 = ?" (using O's for zeros). I don't understand why people feel computers are getting "more human", they're simply not, they're just getting more and more programming. Some bot writer will eventually get burned by this question and add the concept to his bot's programming, but has that really made it more human? I'll just switch to homophones, puns or other language devices, the possibilities are endless. In my opinion creative, original, human behavior from a program is so far off, it's depressing to think about. Also, we humans are getting "smarter" (better at solving problems), so it's not even clear to me that computers are getting "more human" faster than we're learning and differentiating ourselves from programmed behavior.