Provides instructions for science projects that teach about robots, covering parts, microcontrollers, sounds, construction, LED lights, and touch sensors.
Describes the different designs and construction techniques used by various birds to build nests that best suit their needs. Also provides information about particular species mentioned.
The Hoover Dam is more than just an enormous concrete wall. It is an engineering marvel achieved by careful planning and hard, dangerous work. Seventeen turbines inside the dam produce electricity for millions of people.