Turbulence and its mathematical modelling are of fundamental importance in industrial CFD. So, it is essential that the engineer, whether undergraduate or trainee, understands at least a little of the subject. However, it can be difficult to grasp. Nevertheless, a great teacher can overcome obstacles to understanding. Professor Brian Launder's lectures, talks and presentations on the mathematical modelling of turbulence have done that, and more; they have also inspired countless students to study and contribute to the subject. We may ask: from where does this ability stem?