A word to the wise ain’t necessary—it’s the stupid ones that need advice. –Bill Cosby Stupid people have lots of problems. They mess up, foul up, and screw up. In a world in which intelligence is ...

The idea that stupid people are also plagued by meta-stupidity could be corroborated, for example, their estimated percentiles (i.e., what percentages of others they think they outperformed) were even ...