All of these websites will give you an amazing collection of information on general knowledge.
Ask the Experts
Awesome Library - K-12 Education Directory
Education 4 Kids - "Once upon a time there was a dream that there would be a set of resources on the net that would exist solely for kids to use as an educational "center". A place where they could come and play drill games to better their skills and to learn. This is the place."
Educational Hotlists - from the Franklin Institute
Educational Index - an annotated guide to the best education-related sites on the Web.
Facts Subject Index - Refdesk - 24 Reference Categories.
FunBrain.com - "The Internet's #1 Education Site for K-8."
How Stuff Works
How Everything Works
Internet Public Library
Kidinfo - A great way to find both fun stuff and information for completing your homework assignments.
KidsClick! - web guide and search tool for kids by librarians.
LibrarySpot - a virtual library resource center for educators and students, librarians and their patrons, families, businesses and just about anyone exploring the Web for valuable research information.