We all are biased towards something and this prevents us from dealing with actual reality in an effective way. Few (maybe ver few) people are prepared to accept such biases. However, discovering our own biases seems to require not only a substantial honest effort but, also, some practical method to help us with such a challenging task.
So much for the common man in the street. But, what about researchers. Yes, those people whose dalily job compels them to make sure that their interactions with actual reality is fully honest.