The 30 short and simple science demonstrations from any of these books can be used as "hooks" to lead into Bible lessons for a group (family, Sunday school class, etc.). Emphasis is primarily upon Bible truths rather than scientific knowledge, although scientific explanations are given. These books can be used with various age groups since object lessons such as these interest just about everyone. Information for the actual Bible truth presentation is offered, but it will be up to the presenter/teacher to determine the best way to do that. This is a great tool for dads to use for family devotion time. [Valerie Thorpe/C.D.]