I learned that lesson when I was teaching my first continuing education class in woodworking. It quickly became apparent that I had some absolute beginners in the class. So I began the class discussing the properties of wood and how to read a ruler. While I may work with fractions every day, many of the students in my classes did not, and more often than not, fractions intimidated them. They wouldn’t know where to find a 1/8″ if their lives depended on it.
The same is true about wood. Many of the students had no idea about the different types of trees. Trees were something they learned about in grade school, and because trees no longer had any real relevance in their lives, the information was relegated to the dungeon of their memories.