Fact Monster: Online dictionary, almanac, atlas, encyclopedias, biographies, math flash cards, and much more!
Kids InfoBits: Kids InfoBits is designed for beginning researchers in Kindergarten to 5th Grades. Featuring a developmentally appropriate, visually graphic interface, the most popular search method is moving from a broad subject to a narrower topic using the subject-based topic tree. The curriculum-related, age appropriate, full-text content is from the best elementary reference sources and magazines. This database covers geography, current events, the arts, science, health, people, government, history, sports and more.
Ask Dr. Math: Got a math problem? Ask Dr. Math! You can browse or search by elementary, middle or high school level to find answers to common math problems. Don't see your problem listed? No problem! Email Dr. Math with your question.
Kids.Gov: The Official Kids' Portal for the U.S. Government. Find links to government and other kids' sites - grouped by age and subject. Explore, learn, and have fun!