We have a long standing program here for kindergarten children. The lab portion includes a walk through of what is involved in a blood collection with all of the equipment visible, jars containing red liquid with the amount in the jar representing how much blood is in the body of an adult, child, and newborn. A microscope to show what is on a blood smear is always a hit. Path specimens in a container are usually either "Oh gross!" or "cool!" depending upon the individual. Hope this is of some help.