A very popular New York Times article this week is about people trying to find a way to build a better teacher. The entire article is very much worth a read. One passage in the article caught the Korean's eyes:

When Doug Lemov conducted his own search for those magical ingredients, he noticed something about most successful teachers that he hadn’t expected to find: what looked like natural-born genius was often deliberate technique in disguise. “Stand still when you’re giving directions,” a teacher at a Boston school told him. In other words, don’t do two things at once. Lemov tried it, and suddenly, he had to ask students to take out their homework only once.

Building a Better Teacher (New York Times)

The Korean does not know if his reaction is based on the fact that he is a Korean, or that he is a son of two very successful teachers. At any rate, the Korean's reaction was: People don't know this?

The Korean volunteers frequently at a NYC public school, and he has always been one of the most effective volunteers in getting a classroom full of high school students under control and follow his directions. The manner in which the Korean does that has always been very obvious to the Korean - strong voice, squared shoulders, locked hips, determined glare. It is how you are supposed to project authority. It is, to the Korean, as natural as breathing. Did the Korean somehow come to pick up a skill that a majority of people do not?