Scott Foresman: Resources for units of study on Life Science, Earth Science, Physical Science and the Human Body.
http://www.sfscience.com/

Radar’s Chem4Kids: Site provides background information on atoms, elements, compounds, and more.
http://www.chem4kids.com

Nasa Space Place: Explore earth and space. spaceplace.nasa.gov

San Diego Zoo Kids: Resources for learning about animals. kids.sandiegozoowildlifealliance.org

Chrome Music Lab Experiments: There are lots of sound and science concepts to experiment with here. musiclab.chromeexperiments.com

Artsology.com: Science and art come together in fun activities. artsology.com