(3) 4-6 Turning Point Inventions series. Illustrated by Toby Welles. Beginning with Stonehenge, sundials, and water clocks, the concise text explores how cultures have historically responded to the need for more precise time keeping. The well-designed volume showcases early mechanical clocks, explains how clocks came to be mass-produced, and discusses the proposed future use of "Internet time." Photos, reproductions, and a color foldout make the book browsable. Bib., ind.

Reviewer: Peter D. Sieruta