Want to play 20 Questions? This is a simple concept done really well. The basic concept is a binary search tree. The computer asks a question, and then depending on a yes or no answer it goes to another question until it runs out of questions, and then it knows the answer.
This one uses a fuzzier approach. Instead of just yes and no it takes multiple answers (maybe, unlikely, etc.) and it also keeps track of all the answers it gets, realizing that people disagree. The result is a system that is really good at guessing what you are thinking about in 20 questions or less.
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