As it is impossible to rank them in order of importance, they are listed chronologically from as far back as 35,000 BC to the discovery of Oetzi, the Ice Man in 1991. Each article goes into detail about who the discoverers were, how the discoveries came about and their significance. For example in 1543,while on his deathbead, Polish astronomer Nicholas Copernicus published his theory that the Sun is a motionless body at the centre of the solar system. To make reference easier the book is divided into five sections: 1. Early Discoveries 2.The Great Age of Discovery 3.The Age of Enlightenment 4.The Nineteenth-CenturyWorld 5.The ModernWorld