How does the color of the sky change from blue to reds and oranges to black? An illuminating lesson explains how light travels through different mediums using the sun's light as an example. By examining diagrams and illustrations, pupils...

Now you see it, now you don't. Our moon seems to pull a disappearing act from time to time—but why? Take your seventh grade scientists above and beyond to discover the truth about the moon and the role it plays in Earth's little...

Picture someone's excitement of seeing a horse for the first time. How about a cow? The Columbian Exchange changed life for not only Native Americans, but also for Europeans and the entire world. The second lesson of a 22-part series...

How does an individual take a stand for a principle or belief? what skills are required to do so? What are the challenges and risks in doing so? Class members study examples of individuals engaging in such activities and then identify...