Central Kansas Library System

In the year 241, twelve-year-old Lina trades jobs on Assignment Day to be a Messenger to run to new places in her decaying but beloved city, perhaps even to glimpse Unknown Regions.

When a roamer trades them an ancient book with only a few pages remaining, Lina and Doon return to Ember to seek the machine the book seems to describe in hopes that it will get their new community, Sparks, through the winter.

"Accessible information about circuits, conductors, and cells will help readers grasp the fundamentals of electricity. Fun experimentssuch as building a robot head or making an electronic switchbring these lessons to life in a safe, manageable, and exciting way"--Provided by publisher.

Eleven-year-olds Luis and Maura investigate the cause of a long-term, city-wide power outage in Hampton, New Jersey. Includes facts about electric power and instructions for assembling an emergency kit.