 Here is another illustration of how quickly a discussion of logic can move to a discussion of deep philosophical issues (Pritchard, 1985). This is a group of 5th graders considering the sentence, “All people are animals.” One of the students offered this as another example of a true sentence that becomes false when reversed. Jeff objected that “All people are animals” is not true. Chip proceeded to develop a taxonomy that relegated people, along with elephants and tigers, under the heading of mammals, mammals under animals, and animals under living things. Jeff continued to object.