Set 6 includes: Flight (Kit 16) – Heart and Lungs (Kit 17) – Digestive System (Kit 18)A JOURNEY INTO THE HUMAN BODY. Make planes, parachutes, jets, windmills, and spinners before " flying" into the fascinating world of the heart and lungs. Young scientists measure lung volume, make heart and lung models, and design a working stethoscope. The journey continues with the digestive system where the enzyme pepsin eats away gelatin, iodine colors starch, and fats make brown paper translucent. This kit is a sure winner with all Young Scientists that have aspirations in the health care profession.