An Invisible Force

Follow the quest to understand the laws of motion and gravity—to formulate the ups and downs of physics and solve the mysteries of the strange forces that propel all objects on Earth.

An Invisible Force traces the historical and scientific path to man's understanding of motion and gravity. From stargazing astronomers to a look at accelerating future developments, young readers are drawn into an age-old science quest.

Author Glen Phelan guides young readers through the quest towards understanding the invisible forces at play on our planet.

The experts at National Geographic invite inquiring young minds to follow historical "quests" towards some of the most important scientific discoveries of our times. This inspirational series examines the history, defining research, and background of specific discoveries, and their repercussions through the ages. The achievements of individual scientists are highlighted, and personal histories are profiled. A useful timeline, informational sidebars, research tools, tips, and fact boxes ensure young readers actively learn about the history of science and are motivated to pursue scientific inquiry.