Margaret J. Goldstein

"Conditions on Mars make landing there very challenging. Readers get a close-up look at these challenges, plus information on how scientists have successfully landed rovers on Mars and how they might land humans there someday"-- Provided by publisher.

"Since its beginning, gymnastics has been full of epic moments! Learn about the key gymnasts, teams, and events from around the world that have made for incredible stories in men's and women's gymnastics"-- Provided by publisher.

Every day, people on Earth use about 90 million barrels of petroleum (oil and natural gas) to fuel cars, buses, airplanes, farm equipment, and factories; to heat their homes; and to manufacture detergents, paints, plastics, and countless other products. To get that petroleum, oil and gas companies search all over the planet--from northernmost Canada to deep under the ocean. Because it is such a valuable commodity, petroleum has become known as black...

"Since Steve Jobs helped found Apple in 1976, the company has been at the cutting edge of computing, introducing the world to personal computers, the iPhone, and more. Learn about Apple's past, present, and future"-- Provided by publisher.

"Are there signs of life on Mars? What is on the Martian surface? Scientists are investigating the planet to find out, and readers can learn about their plans to send up human explorers one day!"-- Provided by publisher.

"With its groundbreaking Windows operating system, Microsoft transformed personal computing. Learn how founder Bill Gates turned Microsoft into one of the biggest companies in the world using cool technology and the power of coding"-- Provided by publisher.