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The study of religiosity and intelligence explores the link between religiosity and intelligence or educational level (by country and on the individual level). Religiosity and intelligence are both complex topics that include diverse variables, and the interactions among those variables are not always well understood. For instance, intelligence is often defined differently by different researchers; also, all scores from intelligence tests are only estimates of intelligence, because one cannot achieve concrete measurements of intelligence (as one would of mass or distance) due to the concept's abstract nature.