http://www.sciencebuddies.org/science-fair-projects/project_scientific_method.shtml
http://www.edquest.ca/component/content/article/91
http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles3/metric/metric.html
http://www.brainpop.com/science/scientificinquiry/scientificmethod/