An excellent essay from the National Humanities Center that explores the civil rights movement after the groundbreaking legislation in the 1960s. It looks at how the civil rights movement has transitioned in the last part of the 20th and...

Outstanding information (and a lot of it) on gas turbine (jet) engines. Describes the history behind their development and the theory behind their operation. Well written and includes very informative graphics.

Learners apply their mathematics and team building skills to explore the concept of rocketry.Throughout the design process, teamwork is emphasized since the most successful launches occur when groups work effectively to generate creative...

A question and answer format is used to relate elastic potential energy to the bounce of a rubber ball. Explanation of this simple phenomenon is thorough, complete, and free of trite statements.

A physics definition of collisions with examples to illustrate the concept and related links to problems and solutions.