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How do you spot a person of low intelligence? What red flags do they give away while communicating with you? And yes, looking at school grades isn't really a good way to tell, because by "intelligence" I mean the term "fluid intelligence" specifically, which is the quality of the ability to construct an accurate model of reality in your head (as opposed to the amount of accumulated knowledge).
Which then can be used to accurately predict outcomes of real-life scenarios and allows the person to change those outcomes. In other words, those people have more control over their lives and can manipulate the reality to suit their needs or achieve their goals. They can act quickly and effectively in their own interrest (use their intelligence for their personal gain, but this is their conscious choise as opposed to people whose of quality of life they are able to achieve is limited by their mental ability rather than by their moral choise or other factors).
Which then can be used to accurately predict outcomes of real-life scenarios and allows the person to change those outcomes. In other words, those people have more control over their lives and can manipulate the reality to suit their needs or achieve their goals. They can act quickly and effectively in their own interrest (use their intelligence for their personal gain, but this is their conscious choise as opposed to people whose of quality of life they are able to achieve is limited by their mental ability rather than by their moral choise or other factors).