The progression and evolution of measurement has run parallel to the development of civilisation. From early systems that made universal trade possible all the way to modern methods that allow investigation, understanding and control of the chemical, physical and biological processes of the natural world. Understand the origins of our units of measurement, who discovered them, the ways in which they have developed and changed over time and the many connections between them. Together units of measurement help us to fathom the scale of the universe and give mankind a set of tools that enable us to think in detail about the physical world and extend our knowledge.