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Thing line between Knowledge & Wisdom
8 Reasons Smart People Do Stupid Things

It's good to be smart. After all, intelligent people earn more money, accumulate more wealth, and even live longer. On the surface, being smart looks like easy living. But there's another side to the story.
Intelligent people have a reputation for making dumb mistakes, especially in situations that require common sense. The simplicity of these situations and the abundant intelligence of those who tend to muck them up can be downright comical.
"Common sense is not so common." -Voltaire
After decades of research, scientists are finally beginning to understand why this happens. Shane Frederick at Yale University was among the first to conduct research that explained why rational thinking and intelligence don't tend to go hand in hand.
In his studies, Frederick gave people simple problems to solve, like this one:
A bat and ball cost a dollar and ten cents. The bat costs a dollar more than the ball. How much does the ball cost?
Frederick found that some people have the tendency to confidently blurt out the wrong answer, stating that the ball costs ten cents. You, of course, knew that the correct answer is that the ball costs five cents, and you're completely justified if you're wondering if the, well, less-than-smart people were the ones blurting out the wrong answer.
Psychologists from James Madison University and the University of Toronto wondered the same thing. They gave similar tests of logic to hundreds of people and compared the accuracy of their answers to their levels of intelligence. The researchers found that smart people were more likely to blurt out the wrong answer because they actually make more mental mistakes when problem-solving.
Smart people are more prone to silly mistakes because of blind spots in how they use logic. These blind spots exist because smart people tend to be overconfident in their reasoning abilities. That is, they're so used to being right and having quick answers that they don't...