Simple text and photographs introduce clocks, including the different types and the history of measuring seconds, minutes, and hours. Includes online content that contains weblinks, audio and video clips, activities, and other features.

AV2 book code -- Keeping track of time -- Rising with the sun -- The sundial -- The hourglass -- The clock -- Minutes and seconds -- Telling time -- Analog and digital -- Other ways to say the time -- Terrific timekeeping -- Key words/Log on to www.av2books.com.