Robert E. Wells

Introduces the concepts of very large numbers, up to a googol, and multiples of ten.

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

Discusses the mystery of time and how it passes by and how me keep track of it.

In this work about the water cycle, readers discover that the molecules in their glass of water may have once been part of a dinosaur watering hole.

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. Ilustra el concepto de grande, más grande, más grande y mediante la comparación de las mediciones físicas de tales cosas grandes como la ballena azul, una montaña, una estrella, y el universo.