Thomas Edison didn't have much in the way of a formal education. Once he learned to read, his mother encouraged him to learn on his own. And he read a lot, about a wide variety of subjects. As a business owner, Edison hired plenty of employees, but didn't really care whether they had a college degree, as he thought higher education was overrated. Instead, he screened potential employees with a test he made up himself. Edison's tests varied over time, and he never made them public. But they us...

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