Chem-4-Kids: Biology, Chemistry and Physics fun for kids
http://www.chem4kids.com/
EPA Student Center: For students K-12
http://www.epa.gov/students/
GovSpot: portal to all government websites for kids
http://govspot.com/features/kids.htm
Ready.gov: How kids can prepare for disasters
http://www.ready.gov/kids
Science Master: Science/education portal for K-12th students and teachers
http://www.ScienceMaster.com/
Sparky the Fire Dog: Sparky teaches kids and families about fire safety
http://www.sparky.org/
U.S. Patent and Trademark Office: How can kids become inventors?
https://www.uspto.gov/kids/kids.html