[Set 1]. Life science 1. The activities of life. 2. Built for living. 3. The next generation -- [Set 2]. Earth science 1. The earth we live on. 2. Oceans of air and water. 3. Energy and space -- [Set 3]. Chemistry 1. The materials of nature. 2. Chemistry of mixtures. 3. Chemistry of metals -- [Set 4]. Physics 1. The forces of nature. 2. Matter and energy. 3. Sound and light.