A series of graphics, downloadable animations and text describe and explain the motion of a pendulum. Some sections require an understanding of calculus.

The motion of three simple harmonic oscillators is animated to illustrate the effects of mass and spring constant upon the motion. Several equations and a lengthy discussion accompany the animations.

This resource provides a look at the circulatory system of a frog in dissection.

This site from the Penn State University provides reports of a study on the effects of divorce on the views of children regarding marriage and relationships.

This site from the Pennsylvania State University provides a hands-on activity to bridge the gap between right triangles, 30-60-90 and 45-45-90 theorems, and trigonometry, and what every student wants to know, "When will I ever use this?"...

Penn State University offers a sample problem finding roots of a quadratic function.