Includes 3 complete The Young Scientist Club kits in one low-priced set! Kit 16 Flight - This kit focuses on moving air. Young Scientists make planes, parachutes, balloon jets, windmills, and spinners. The air of experimentation will be filled with lots of excitement and flying objects! Kit 17 Heart and Lungs - Young Scientists learn about the basic anatomy of the circulatory and respiratory systems by measuring lung volume, making heart and lung models, and designing a working stethoscope. This kit is a great introduction to the world of human physiology. Kit 18 The Digestive System - Young Scientists study the different parts and functions of the digestive system by observing the enzyme pepsin eat away gelatin, making iodine color starch molecules, and by having fats make brown paper translucent. This kit is also a first introduction to the differences between starch, protein, and fats.