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A word tree is a visual search tool for unstructured text, such as a book, article, speech or poem. It lets you pick a word or phrase and shows you all the different contexts in which it appears. The contexts are arranged in a tree-like branching structure to reveal recurrent themes and phrases.

Worldmapper is a collection of world maps, where territories are re-sized on each map according to the subject of interest. There are now nearly 700 maps. Maps 1-366 are also available as PDF posters. Use the menu above to find a map of interest. To learn a little more about this and other map projections read this: Worldmapper and map projections. We recently added a new series of maps of the world's population using a new mapping technique: Worldmapper Population Atlas

Intelligent Video: The Top Cultural & Educational Video Sites Looking for great cultural and educational video? Then you've come to the right place. Below, we have compiled a list of 46 sites that feature intelligent videos. This list was produced with the help of our faithful readers, and it will grow over time. If you find it useful, please share it as widely as you can. And if we're missing good sites, please list them in the comments below.