Hi Zeyu, thanks for your feedback and the the heads up regarding the Who’s and Whose. I am a bit baffled that none of my editors have pointed this out, but there you go, we are all human after all. When I realised that I had used “whose” in the attached drawing, it dawned on me that I must have thought about this before (I can’t remember). Anyway — long story short, I changed it. Glad the article was helpful. Warm regards from Berlin!