(Sample link) NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
(Sample link) Fun activities - by girls....for girls. http://www.missoandfriends.com/
CIA World Factbook-- A great tool for those nagging specific questions like, "What is the capital of Rwanda?" Which, in case you were wondering, is Rigali. https://www.cia.gov/library/publications/the-world-factbook/
This website will show you the Academic Standards for Education set by the state of Pennsylvania. These are the standards which every classroom lesson is designed to reinforce. http://www.pde.state.pa.us/stateboard_ed/cwp/view.asp?a=3&Q=76716&stateboard_edNav=|5467|
This is just a really neat website that has top ten countdowns that are pretty interesting. This countdown is concerning the top ten mysteries of history. Such as, "Who was Robin Hood?" and "What are bog bodies?" http://www.livescience.com/mysteries/top10_history_mysteries-1.html