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A second place to burn some spare time is the Fun With Words site.
ScienceWorld if you are looking for a serious technical reference.
The Smithsonian Institution.
The Metropolitan Museum of Art has a lot of stuff online, as does The National Gallery of Art. They each have a special section for kids. It may take lots of clicking to get to some of stuff on each of them.
The Louvre is online.
If you are interested in Modern Art: The Museum of Modern Art.
Finally, there is a search engine dedicated just to art: The Artcyclopedia.