A simple explanation of the moon and why it changes shape throughout the month.

A simple introduction to smart machines, most of which currently do not take human form, performing tasks too dangerous, too boring, or too difficult for people to do.

Describes the development of a seed into a plant by means of pollination, fertilization, and seed dispersal.

An introduction to the state of Illinois, its geographical features, people, and history.

Provides brief information about each of the nine planets that makes up our solar system.

Describes a variety of flowers and explains how and why they bloom.

A simple introduction to the geographic features, people, and animals of the continent of South America.

A simple explanation of how horses are beautiful and useful animals.

A simple description of the physical characteristics and behavior of turtles.