What Happens to Four-year-olds?

For many years, I struggled to understand why normal four-year-olds who are eager to learn ... become fifth graders who are either emotionally disengaged from learning, or are students who appear to be motivated solely by rewards. I encountered these fifth graders everywhere I went, and as a secondary teacher, virtually all of my students were these ubiquitous fifth-graders grown up. (Click on the title for the full post.)