When it comes to a science fair idea, there are endless possibilities. There are lots of factors to consider, including the age of the child doing the project, how involved the teacher wants it to be, and most importantly, what the student is interested in learning about. It is important to have them choose a subject that they enjoy or they will lose interest and it will reflect poorly in their work. Judges want to see that the students have learned something from their project and can explain it fully in their own words. One interesting science fair idea for younger students is to test and see which brand of paper towel is the strongest when wet. To do this you will need to gather a few materials including three (or more if you would like) different brands of paper towels, a glass with a wide opening, a rubber band, a spoon, a handful of pennies and, of course, some water. Take a sheet of paper towel from the roll of the first brand and place it over the glass, then p...