Clarify the difference between transitive and intransitive verbs and when to use lay versus lie. Various examples are given before writers practice underlining verbs, circling the object of each verb, and filling in sentences with either...

Time to move into the third dimension! Learn the names of the geometric solids and count faces, edges, and vertices. Then learn to recognize nets that create a given solid. 

Le Chatelier's interest in thermodynamics and building materials such as cement and plaster led to the Le Chatelier Principle in 1884. Activity 13 in a series of 36 extensively explores chemical equilibrium. Learners read about...

A lengthy essay on George Washington proposing that his real accomplishments as first President of the U.S. and winner of the Revolutionary War have been overshadowed by the myths and stories of the Cherry Tree, teeth, and no lies....

The Zande, whose homelands lie within three modern African states (Republic of the Sudan, Zaire, Central African Republic), constitute a large and complex amalgam of originally distinct ethnic groups, united by culture and, to a...