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This collection of cartograms, or density-equalizing maps, shows the world's territories re-sized on each map according to the variable being mapped. Over 100 variables have been mapped, including population, land area,...
Water Conservation: Mexico
Ground water is the primary source for both municipal and industrial water supplies throughout the world. Some of the world's largest and fastest-growing cities depend heavily on natural aquifers that collect and store...
Water Conservation: Israel
A recent report stated that in the next decade or so, nearly half of the world's population will live in countries whose water supplies are over-stressed. In parts of Africa, northern China, southern Asia, and the...
Searching Out The Singing Life of Birds
This radio broadcast features an interview with Don Kroodsma, who is recognized as the leading expert in bird songs and bird vocal behavior. It includes recordings of bird songs he collected on his tours around the...
Caves and Karst
This interactive feature introduces viewers to the various types of caves, and describes Karst activity, the process by which naturally-occurring acidic solutions form cavities in soluble rocks. Other topics include...
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