DESC: Safty warning- choking hazard/ ages 8 and up/ Educational Insights. 21 science projects. The wide and wonderful sky above us is filled with visible and invisible science in action. The 21 do-it-yourself science projects in this kit guide you through some awesome discoveries from the ground up. Kit includes thermometer/ compass/ test tubes/ poster paints/ eyedropper/ 60-page activity guide and more!