Set 4 includes: Bacteria and Fungi (Kit 10) – Weight and Volume (Kit 11) – Acids and Bases (Kit 12)GROW, MEASURE, AND MIX. Young Scientists of all ages will be fascinated by growing bacteria and fungi of all colors in Petri dishes. Discover how antibiotics can cure disease. Young scientists make and calibrate a scale, learn about density, and test all kinds of substances with pH and litmus paper. Finish this set with some real copper plating.