Yahooligans! - Science and Oddities Science http://www.yahooligans.com/Science_and_Oddities/

Yahooligans! - Science and Nature Experiments
http://www.yahooligans.com/science_and_nature/Experiments_and_Activities/

More Science Experiments Science
http://www.halcyon.com/sciclub/kidproj1.html

Science experiments and activities Science http://www.sciencemadesimple.com/projects.html