It takes brains to understand an IQ's value

WHAT is intelligence? Is it a mind-boggling capacity for general knowledge, or the ability to solve novel problems? Perhaps it is original thought, the ability to formulate witty remarks or learn multiple languages.

Although all these criteria can be used to describe intelligence to some degree, it is a quality that is impossible to summarise in one sentence, let alone put a number on. So is it appropriate to rank individuals on a numerical sliding scale which t...