Describes perceptual activities which involve children in questioning perceptions of size and distance that typically appear obvious but that are not accurate. Activities are designed to help the child consider variables that do not always stand out visually but which are important. (BR)

Aluminum foil, because of its characteristics, can be used for many elementary science activities: demonstrating Archimedes Principle, how to reduce cohesion, reflection and mirror effect, fuse action, condensation, friction, and as containers and barriers. (BR)

Presents basic physical theory for movement of electric charges in clouds, earth, and air during production of lightning and thunder. Amount of electrical energy produced and heating effects during typical thunderstorms is described. Generalized safety practices are given. (JM)