Christensen, Victoria G.

Discusses the geography and resources of the freshwater biome as well as how animals and people have adapted to and impacted freshwater environments.

Discusses the geography and resources of the grassland biome as well as how animals and people have adapted to and impacted grassland environments.

Have you ever seen lights turn on automatically when you step into a restroom? Or have you ever wondered how a garage door knows not to close when someone is standing beneath it? What these and countless other electronic devices have in common is a sensor. But how do sensors work? What are they used for? Discover how robotic and electronic sensors can be programmed to work as our five senses do, and learn how they are used to save energy, keep us safe, and sometimes make life a little more convenient!.

Did you know that trees, buildings, and even people can act as conductors for electricity? Or have you ever wondered why we're warned not to go outside during a thunderstorm? Scientists, engineers, and electricians use conductors in their work and research, but conductors are also found in many of the devices and tools we use every day. But how does electricity travel through a conductor? Why are some materials better conductors than others? Discover how a conductor works, as well as what makes a good insulator, and explore how different types of conductors work in modern technology!.

Discover the history of batteries and how scientists and engineers figured out ways to store electricity. Explore what makes up a battery, including an anode, cathode, and electrolyte, and learn how batteries can power all kinds of electronics from a cell phone to a bus!.