Science Fair Project Ideas
http://www.terimore.com/
http://www.education.com/science-fair/elementary-school/engineering/
www.sciencebuddies.org
http://school.discoveryeducation.com/sciencefaircentral/?pID=fair
http://www.all-science-fair-projects.com/
http://www.juliantrubin.com/fairprojects.html