How does GPS know where everything is located? Pupils read about satellites that are mapping the ocean and the question on how satellites know where they are. Readers discover the workings of the Global Positioning System and create...

Informative site about mountains. Look at the picture and read all about mountains, then take a quiz to show how much you know!

Read Clark's remarks about their journey from the lower portage camp to the upper one. You can also view Clark's 1814 map of the Falls and Portage.

Nicholas King drew up a map in preparation for Lewis and Clark's expedition. View images and read descriptions of one of the landmarks in the Rocky Mountains, Bear's Tooth.

Here, read statistics from the US Department of Health and Human Services concerning exercise and its key role in preventing chronic illness and premature death. Use these findings from medical studies in which diseases were studied in...

Many people in America and the rest of the world are currently struggling to have enough to eat. Learn about the hunger crisis, view a map of the world hunger problem and read about the work being done to help those in need.

Read interesting facts on the Spotted Salamander including information on its physical characteristics, habitat (with a distribution map), diet, breeding patterns, unique traits and behavior, conservation status, and tips on what you can...