People used to think that Earth was flat, but now we know it isn’t. How did we find out Earth is actually a sphere? How did science help us understand the shape of our planet? Readers will delight in
What’s the difference is between a planet and a moon? What exactly is a planet? How did the moon form and how does it affect Earth? This book explores one of our most familiar nighttime sights, the mo
From the earliest human settlements near present-day Peru to the more recent Inca civilization, readers will be fascinated by the important archaeological finds that have occurred in this region. This
Nuclear weapons have played an important role in times of war and peace since they were first used in 1945. The use of these weapons has been a topic of strong debate for over 7 years. Readers explore
