Discusses human evolution and the search for the earliest forms of humans, examining the Neanderthals, Homo erectus, the variety of fossils found in Africa, and the early apelike hominids.
Describes the development of geological theory from the ancient Greek philosophers to the discovery of plate tectonics, which explains the forming of geological structures.
Examines the impact of human population growth, discussing the origins of the human species, the rise of cities, migration to the new world, population trends, and the scarcity of natural resources.
Discusses what is currently known about memory and how it works, and makes suggestions for improving one's memory through mnemonic techniques and proper organization.