20 Questions Neural Network

"Want to see an example of what artificial intelligence could do for search? Take a look at 20Q.net, which is an online version of the child's game 'twenty questions.' The premise behind the site is simple: Think of a common object, and then answer a series of questions. 20Q will then 'guess' what you're thinking about. Just about every time I've used it, 20Q has correctly identified the object I've imagined using fewer than 20 questions.

If 20Q.net can't guess what you're thinking, you 'win' the game. The system then presents you with a list of other possible objects that you might have been thinking about. If the object is in the list, click on it, and 20Q will explain its logic to you, indicating contradictions between your answers and its own knowledge base. These aren't necessarily 'wrong,' but rather are an indicator of the learning 20Q.net has gained by interacting with other people.

20Q is a neural network that works much like a human brain. The software has been 'trained' by thousands of users playing the game over the past decade. By interacting with users, the neural net has learned about objects in the real world, and continues to learn as it analyzes each game."

From this searchenginewatch.com post.