A virtual world, also called 3D Metaverse, is a computer-based simulated environment intended for its users to inhabit and interact via avatars. Avatars are usually depicted as textual, two-dimensional, or three-dimensional graphical representations, although other forms are possible(auditory and touch sensations for example). Some, but not all, virtual worlds allow for multiple users.
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Whyville
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Whyville is an educational virtual world for children and teens, ages 10-16. This virtual world encourages it's visitors to participate in fun, educational events to simulate a "hands-on" learning experience with science projects.
Runs on "N.I.C.E." The Numedeon Interactive Community Engine
