It is the year 150 MILLION B.C. You have travelled back to a time when dinosaurs rule the earth. You are alone in a prehistoric pine forest when a huge dinosaur -- a flesh-eating Megalosaurus -- comes staggering toward you. It looks sick and weak -- but suddenly it turns on you with a tremendous roar! You can run from the angry creature or jump quickly to another era. Your decision can lead you to safety -- or leave you stranded in time! Are you ready to face the danger? The Time Machine series challenges young readers to use their imagination and decision-making skills to write their own story. Options in the text allow readers to choose any path they like within the plot. Readers must draw on background information about the period to make the right choices. This makes the series a great educational device for youngsters to learn about history and all the different cultures, events, and periods that shaped it.