To appreciate that some questions are better than others, it helps to consider a few examples of questions that are bad.
To find them, try playing Twenty Questions with a young child. In trying to guess an animal, a young child might ask: Is it a koala? Is it an elephant? (Not: Is it a mammal? Does it live in Africa?) These are bad questions in the sense that they’re unlikely to yield an efficient solution to the problem of discovering the animal one’s adversary has chosen.
In the simplified world of Twenty Questions, it’s relatively easy to evaluate what makes a question good or bad. Unfortunately, generating good questions in the real world is often a more complicated affair.
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