The Math, Science and Technology Expo is a grade-wide project designed to enhance students' interest and knowledge in math, science and technology. Each student will be responsible for doing an experiment or exploring and researching a topic and then making a visual presentation to present at the expo. During the expo, students will present their projects to students from other classes around the school and will have their parents come to see the class' work at the evening Curriculum Fair. There are many resources out there. Here are some links that may help you get started.
http://coolsciencefairprojects.org/
http://www.cool-science-projects.com/
http://www.sciencebob.com/sciencefair/index.php