Back in late 1999, two psychologists from Cornell University—Justin Kruger and David Dunning—put it to the test whether people who lack the skills or abilities for something are also more prone to lack awareness of that lacking. They started off their research paper with an example of a Pittsburgh bank robber, McArthur Wheeler. McArthur was arrested in 1995 shortly after robbing two banks in the middle of the day, with no mask on, or any other kind of disguise. When the police caught up to him and showed him the footage from security cameras, the robber was confused. "But I wore the juice," he protested. As it later turned out, the poor man believed that if you rub your face with lemon juice, it will be invisible to security cameras. Yeah, right... The two psychologists did other tests too

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