Too often, teachers are expected to "cover" a set of details and we end up missing what's really important. Whether the card was the three of hearts or the queen of spades is not significant. Solving the problem of "how they did it" is the real challenge. Take, for example, a recent problem-based learning activity in my son Ethan's fourth grade class with Mrs. Howey.
Oh, and there was passion? Did I mention passion? What else could a parent ask for from a rock star teacher's lesson.
What is the content? Certainly mass and volume are important terms to know, but in this project students demonstrate that understanding, and much, much more. The kids will probably say they "learned about Pringles." We know it's not really about that.