We must think in concrete terms. All definitions must be based upon things we do. We must visualize and give examples. Here are some concepts and how they should be explained.

 

There are very important ideas from the 20th century that high school students should know, such as quantum limits on measurement, speed of information (time and space), math is logic and consistency, physics is math that can be observed. If we permit our students to graduate viewing the world as scientists from the 19th century viewed it, we are doing an injustice and failing our obligations as professionals. My point is that if high school students must understand these basic things, so too must the teachers.