This is an activity suitable for preschool and lower-grade elementary children. It involves growing mold on bread, fruit, and vegetables. (BB)

Young children are more comfortable in the light because they can more easily recognize their surroundings. In this article there are activities for preschoolers that include controlling a light source, playing with prisms, and shadow play indoors and outdoors. Each activity is described in detail and needed materials are simple. (MA)

Collections and classification activities are the topic of this article. Ways to structure an outdoor collecting venture are discussed. Once the materials have been collected, there are suggestions for introducing young children to the task of classifying their rocks, leaves, shells, and other collected items. (MA)

Describes how children can learn fundamental concepts of measurement by using nonstandard measuring devices and simple comparisons. (MLH)