Measurement Intro

This document discusses different measurement systems and units that were used historically and currently. It explains that early humans measured using body parts like arms, hands, fingers, and fathoms (the length of a person's outstretched arms). It introduces the metric and imperial systems as the two primary systems used today. The document asks the reader to practice estimating lengths and distances using both systems and to measure objects in their room using historical body-based units before the end of the day. It notes homework questions and informs the reader they will need a ruler with both metric and imperial scales going forward in the unit.