Christine Zuchora-Walske

"In a time when the United States could not expand fast enough, railroads became essential for the country to grow ... [This book] narrates the race to build rail lines into the West for money, land, and fame"--Provided by publisher.

Mountain lions once prowled all across North and South America, from Canada to Chile. But as people crowded into the big cats' habitat, mountain lions were forced into smaller areas. Learn more about these big cats, including where they live, what they eat, and how they continue to survive while losing more and more of their habitat to humans.

Bionic eyes are a Modern Engineering Marvel! In this engaging title, readers will explore the history of bionic eyes from early attempts to use electricity to aid vision to the development of computer chips that led to eye and brain implants. Mark Humayun and his development of the bionic eye implant is featured, and colorful infographics show eye anatomy and how implants work. See the future of bionic eyes as scientists work to restore sight in different...

"Using the Internet can be an exciting adventure. But it is important to use it safely. How can you use computers responsibly? And how can you be a good digital citizen? Read this book to find out!"--Page 4 of cover.

An introduction to prairie dogs, including their habitats, physical characteristics, food habits, and life cycle.

"Informative, engaging text and vivid photos introduce readers to the predatory lives of killer whales"-- Provided by publisher.

Do bulls get angry when they see the color red? Do plants grow by snacking on soil? Are bats blind? At one time, science supported wild notions like these! But later studies proved these ideas were nonsense. Discover science's biggest mistakes and oddest assumptions about plants and animals, and see how scientific thought changed over time.

Robots work in homes every day. Some vacuum floors or mow lawns. Others keep people company. And some help kids have fun! What robots might you find in someone's home? Read this book to find out!

It's time for your mission to Venus! Jump in your super speedy rocket to explore Venus's size, atmosphere, temperature, gravity, orbits, clouds, mountains, and craters. Basic solar system facts are brought to life with a focus on what questions scientists are still trying to solve. Each book ends with a section on how scientists discovered the facts that have been presented. Bright, colorful illustrations and straightforward text make this topic accessible...

"Explore the fascinating history of earth and space science! What are Earth's systems, cycles, and resources? What are the solar system, lunar phases, and gravity? Who first studied these concepts? And who later used those early theories to develop these ideas further?"-- Provided by publisher.