With photographs, timelines, diagrams, and illustrations, this book describes how cell phones work, how they have changed the way we communicate, and how they help people keep up-to-date on important information.
With photographs, timelines, diagrams, and illustrations, this book describes how solar energy works, how a solar cell changes the sun's energy into electricity, how a solar farm works, and how solar energy is renewable for future use.
With photographs, timelines, diagrams, and illustrations, this book describes how wind turbines work, why we need electricity for Earth, and how wind is becoming a renewable energy source for our future.
