Explains what energy is, discusses the difference between potential and kinetic energy, identifies energy sources, describes various types of energy such as solar and nuclear, and looks at the future of energy.
A discussion of the animal kingdom, explaining taxonomy--the system by which animals are grouped or organized, and describing the characteristics of different classes of animals.
Explains why light and sound are vital in observing the world, and describes how light is made; reflection, refraction, and absorption; how the eye and ears work; the Doppler effect; and the speed of sound; and includes instructions for a simple periscope.
Presents the life and achievements of the Polish-born scientist, discussing her childhood, her marriage and collaboration with Pierre Curie, and her discovery of polonium and radium, for which she was awarded two Noble Prizes.
A discussion of Earth, describing the atmosphere, hydrosphere, and geosphere, discussing the responsibility humans have for the planet, and looking at what people can do to protect the environment.
