This Chem4Kids.com site explains what equilibrium is in easy-to-understand language. Content includes a great example, as well as exploring different things which effect the position of equilibrium.

[Free Registration/Login may be required to access all resource tools.] Students explain the factors that stress a system at equilibrium and use Le Chatelier's principle to predict how the system will respond to each stress. They will...

See how Stephen Jay Gould's early interest in baseball influenced his thought process as a scientist.

This Illinois Institute of Technologysite provides a lab activity in which students find the center of gravity of a box which has nonuniform weight distribution. Complete with directions and discussion questions; answers provided.