We hear a lot about the importance of the rule of law, but most people do not really know what those words mean. The lesson is a webpage that defines the rule of law, explains why it is important in a democratic society and provides...

Leaves fall off the tree in the autumn, but why do they change colors? The interactive covers the role of chlorophyll and photosynthesis. It also explains both carotenoids and anthocyanins.

Young scholars compare the digestive systems of the buffalo and of the zebra, diagram their systems, and compare their lengths. In this digestive system lesson plan, students learn about their diets as well.