Pliny the Elder was a Roman scholar famous for his Historia Naturalis—Natural History—an encyclopedia published in 77 CE. His one surviving work, it is divided into 37 books that survey all the known sciences of the day, notably geography, anthropology, zoology, mineralogy, and botany. Although the work was the European authority on scientific matters up to the Middle Ages, it is of uneven accuracy. Pliny was in the process of revising the work when he died observing what disaster? Discuss
Source: The Free Dictionary