How many pairs of Nikes® or Apple® products are in the average American home? What makes someone buy one particular type of laundry detergent over another? Scholars grapple with these questions as they develop a list of brands they use...

Lesson 21 in a series of 36 specifically focuses on elements and their compounds from groups 13, 14, and 15 on the periodic table — including boron, carbon, aluminum, silicon, nitrogen, and phosphorus. Classes learn how some of these...