Economist Adam Smith supported free enterprise, he but critiqued mercantilism. These two ideas—seemingly contradictory—may be difficult for some young historians to grasp. A reading that explores these ideas guides scholars in unraveling...

Do scientists really change their minds when presented with new evidence? Young scientists learn about two competing theories and must decide between them. They perform a simulation and have access to actual field data. Then, scholars...

One of the most striking pieces of evidence for Darwin's Evolution of Species was his observations of finches and how their beaks differed from island to island, depending on their primary food sources. So what would happen to the theory...

When DNA research first began, it required almost an entire day to extract the molecules from a cell nucleus. Now it requires less than an hour. Scholars learn about the early theories of DNA with an online interactive, videos,...

Parenting can befuddle new moms and dads, but psychology helps! Learners explain various theories of parenting and child development using a case-study model and materials from College Board. A second practice question asks scholars to...