Your observations could have similar bias issues, though, depending on the contexts and roles where you've met highly intelligent people. You may not (and I may

Your observations could have similar bias issues, though, depending on the contexts and roles where you've met highly intelligent people. You may not (and I may not, nothing personal!) have access to the "upper crust" of intelligent people that would give you an unbiased view. And your observations are inherently much less reliable than, say, an IQ test.