Hank explains that biological molecules are essential sources of energy. They are used for energy storage and are the instructions that help organisms grow. Biological molecules are found in carbohydrates, lipids, and proteins. Hank uses biological molecules to explain why humans don't eat grass and how humans get energy from bread.
Key Words: Sugars, Monosaccharides, Glucose, Fructose, Disaccharides, Sucrose, Polysaccharides, Cellulose, Glycogen
Hank explains polymers, describes some of their properties, and explains how they are formed. He also explains what you need to make a polymer: a molecule that can easily bond to another identical molecule at two points. Hank focuses on the polymer, Polyethylene, because it is the most common plastic in the world, and discusses its nomenclature.
Hank explains the different types of fat (saturated, unsaturated, omega-3, trans) that exist and illustrates their molecular makeup. He uses a jar of peanut butter to relate his explanations to the real world.
Bill explains the three states of matter: solids, liquids, and gases. He explains that these states differ in only the amount of energy they contain. Bill also uses several examples to illustrate the difference between the three states.