Every day we need to make estimates because we don't have a perfect understanding of the world. How long will that car take to get here?

So, how well do you estimate? Some people are over-confident.

I have made a test of over-confidence based on a famous study. It's a fun and possibly surprising way to spend five minutes. As Donald Rumsfeld said, we all know we have "known unknowns" and "unknown unknowns". This little quiz will investigate how you good you are at telling the difference. Follow this link to start the 10 question quiz. 

or read this wikipedia article to learn more: http://en.wikipedia.org/wiki/Overconfidence_effect