There are countless Science Fair project materials. To calculate the content, you must first decide on the course of interest; Astronomy, Biology, Zoology, Chemistry, Earth Science, Engineering, Environment, Microbiology, Physical Science or Mathematics. Once you find the category you want, you can then decide on the matter. It may not be an easy task, as there are countless substances in each category, but it will not take you long before you choose something that really interests you. Just remember that any project has the potential to be a winning science project and note that the judges are looking mainly at presentation and if you learn something from the program or not.
You do not want to pick a topic that is too easy, nor do you want to choose one that is beyond your level. The judges will see that you are knowledgeable about the project and that you have registered your results. Obviously, the first thing they will notice is the introduction, so you want to make sure it is eye catching and well-organized. If you use a chart in the project, make sure to double check the numbers and make sure you understand the grave you are promoting. If you can not explain your work, you are definitely going to lose points. Basically, if you chose a topic that interests you, is your skill level, you really learn something from the project, you can show and explain your work, and present the project organized and eye catching way, you are likely to score great points with the judges.