Billion-dollar brain training industry a sham—nothing but placebo, study suggests

Who wouldn’t want to be smarter? After all, high intelligence can help you get better grades in school, more promotions at work, fatter pay checks through your career, and a cushier life overall. Those are pretty good outcomes by any measure. For years, scientific studies suggested that smarts were mostly heritable and fixed through young adulthood—nothing one could willfully boost. But some recent studies hint that a segment of smarts, called fluid intelligence—where you use logic and patterns...

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