![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirAkDnATVuv_je-8F3Rn3r8Su91raitLoExKf82UgHD1PvUWvUVZzfeD7FMtcANYwoYJfSqi9_e-wwFYibIeUDvFALX2fxN3m6FSFv-qxrXWdRbHzq69DTgnypUf6RTiFlRbFb/s1600/mug.jpg)
Every year I put together the questions and use Stefan as a guinea pig. If he manages to solve the quiz in less than 10 minutes it's too easy. If he hasn't worked it out in 2 hours, taking into account that he knows fairly well the likely sources I have used, it's too difficult. On the Stefan-scale, this year's quiz is more difficult than the ones before, so don't miss it!
The quizzes from the previous years are here: 2007, 2008, 2009, 2010.
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