This document discusses the history of measurement and different systems used around the world. It begins by describing how early humans used parts of the body like hands, fingers, and feet to measure length. It then explains how standardized units developed with trade and taxation, showing examples from ancient Greece, Egypt, China, and West Africa. The document also outlines two common modern systems - the Imperial/English system and the metric system, providing details on how units like inches, feet, pounds and meters originated and are currently defined. It concludes by listing sources for further information on the story of measurement over time.