Cognitive research has revealed that each of us has two types of intelligence: fluid intelligence (abbreviated as Gf) and crystallized intelligence (abbreviated as Gc). Fluid intelligence is our capacity to reason and solve novel problems, independent of knowledge from the past. It’s the ability to identify abstract patterns, use logic, and apply inductive and deductive reasoning. Gf peaks earlier in life. Crystallized intelligence, on the other hand, is the ability to use skills, knowledge, and experience. For most adults, Gc includes both occupational (job) and avocational knowledge
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