Building science or building physics

<正>I like the ancient pattern, where and instead of one’s title one tells the name of one’s mentor. Three mentors shaped my professional life. The first one was in Warsaw, Poland,Prof. Bohdan Lewicki, whose books on concrete panels were translated in many languages. One day, after his class, he told me:‘‘We need to evaluate hygrothermal performance of an experimental building with no-fine concrete,—if you would like to do it, I will provide you with all the money needed. From this day on, I have been learning Building Physics.