Science Buddies (www.sciencebuddies.org)

Science Fair Projects & Experiments (http://www.juliantrubin.com/fairprojects.html)

All Science Fair Ideas (http://www.all-science-fair-projects.com)

Science Fair Resource Guide (http://www.ipl.org/div/projectguide/choosingatopic.html)

Science Fair ideas (https://sciencebob.com/science-fair-ideas/ideas/)

https://www.education.com/science-fair/

Search engines (Google, Yahoo, Scirus)

Science Books / Magazines / Newspapers

Google Science Fair projects (https://www.googlesciencefair.com/student-resources)

How to do a Science Fair project (https://www.jpl.nasa.gov/edu/learn/activities/science-fair-project/)