Presents an historical overview of how time has been measured around the world, focusing on calendars, sundials, shadow clocks, longitude, biological clocks, and atomic clocks.
Explains the history of present-day weight measurement, different ways of measuring weight, discusses weight and mass, and presents some record-breaking weights.
Discusses how people measured lengths in the past, the creation of the measuring systems we use today, how to convert from one system to another, and examples of unusual lengths.
Real-world examples and engaging activities guide readers in learning about measuring time with a calendar. Readers practice selecting appropriate measuring tools and units of measurement, converting between units, and solving problems by measuring.
This series introduces young readers to the concept of time and how we measure time in our daily lives. The titles also explain the tools we use to measure long and short periods of time.