http://www.lawrencehallofscience.org/kidsite/

OLogy
Loads of Science Info, puzzles and games!
by The American Museum of Natural History
http://amnh.org/ology/

Need ideas for you science projects? You should check out:

 http://www.sciencebuddies.com/

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My Pyramid Blast Off
https://www.fns.usda.gov/apps/BlastOff/BlastOff_Game.html


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BIOMES  What's it like where you live?
http://www.mbgnet.net/

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Check out the new kids website from NASA.  It is out of this world!
www.nasa.gov/kidsclub