<p>According to Pliny's definition, Natural History is a book about the natural world or life. It is the first encyclopedic work in history and a model for later encyclopedias. It is also the largest single work to have survived from the Roman Empire to the modern days. In this book, Pliny covers topics including astronomy, mathematics, geography, ethnography, anthropology, human physiology, zoology, botany, agriculture, horticulture, pharmacolog...