Author Pierce shares inspiration for the characters she creates and her devotion to her teen audience.

This site explain ellipse how they are formed with the foci, and gives a nice moving demonstration of drawing an ellipse. Read further down the page to equations of ellipses in different systems, including polar. The last half of the...

Provides a definition and examples of perpendicular bisectors.

Learn about equidistant points with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.

This site, which is provided for by the Rice University, gives a description of the social aspects of the wasp colonies - division of labour.

This article is a biography of Prince Henry and details the value of his work and insights.