Wells, Robert E

Illustrates the concept of big, bigger, and biggest by comparing the physical measurements of such large things as a blue whale, a mountain, a star, and the universe.

Provides a simple introduction to the use of levers, pulleys, and wheels to move heavy objects.

Explains how the sun helps Earth and its inhabitants, by discussing photosynthesis, heat, wind, and more.

Compares the speed of various animals, from humans to cheetahs to peregrine falcons, with even faster things like rockets, meteoroids, and light.

Presents an illustrated introduction to the Earth, describes the atmospheres of the other planets in the solar system, and explains the reasons why Earth is capable of sustaining life.

Traces the history of measuring time, from the Stone Age to the twenty-first century.

Shows how microscopes are used to see the tiniest parts of the universe. Helps readers understand that the size of any object may be viewed in relation to things smaller and things larger.

Presents a children's story about how long giant tortoises can live and compares them to other things around the world that are older such as the Giant Sequoias in California, the pyramids in Egypt, Meteor Crater in Arizona, and prehistoric mammals.

Provides a simple introduction to the use of levers, pulleys, and wheels to move heavy objects.

Bengal tigers are an endangered species due to many human-caused factors, such as poaching, habitat destruction, and global warming. This book explores these difficult topics in a child-friendly manner.