·        Fun Brain

http://www.funbrain.com/

·        A Plus Math

http://www.aplusmath.com/

·        Cool Math 4 Kids

http://www.coolmath4kids.com/

·        Math Wire

http://www.mathwire.com/

·        Sharp Brains Puzzles

http://sharpbrains.com/brainteasers/

·        PBS Kids

http://pbskids.org/zoom/

·        National Institute of Environmental Health (Kid's Page)

http://kids.niehs.nih.gov/games/riddles/index.htm

·        Smithsonian

http://smithsonianeducation.org/students/explore_by_topic/science_nature.html

·        Ed Heads (Science)

http://www.edheads.org/index.shtml

·        The Franklin Institute

http://www2.fi.edu/

·        Learning Science

http://www.learningscience.org/

·        CNN Student News

http://www.cnn.com/studentnews/

·        Science for Kids (ACS)

http://portal.acs.org/portal/acs/corg/content?_nfpb=true&_pageLabel=PP_TRANSITIONMAIN&node_id=878&use_sec=false&sec_url_var=region1

·        The Math Forum @ Drexel

http://mathforum.org/pows/

·        Ask Dr. Math