"What skills do you need to become an astronaut? Why do astronaut trainees spend time underwater and in dark caves? Learn the answers to these questions and more as you get ready to blast off into space!"--Back cover.

How will astronauts survive the long journey to Mars? What will it take for humans to live on the freezing, dusty, airless planet? And what kinds of homes will people build? In this new Science Slam! title, kids will discover the answers to all these questions and many more fascinating facts about how to survive on Mars. Each book is expertly crafted to meet early elementary and science curriculum standards, as well as introduce young space enthusiasts...

"In science fiction, time machines let people travel backwards in history and forward to the future. How could one of these time-traveling devices be created? Scientists have some ideas, which include using spaceships and black holes. Discover the science and technology behind what it would take to make a real-life time machine!"--