Children can be impressively ingenious when given enough time to work thru a problem, but we tend to judge their mental prowess by how quickly they figure things out - is mental speed really the best yardstick for intelligence?
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The relationship between intelligence and reaction time varies with age: Results from three representative narrow-age age cohorts at 30, 50 and 69 years - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5608941/