We had the pleasure to welcome Dr Kalaivanan Nagarajan, who was a postdoc in our lab from 2017 to 2022, for a few days this week. He naturally reinvested his office 108 shared with Dr Eloïse Devaux, as his name is still on the door, and gave us a nice talk entitled “Perturbing a Chemical Equilibrium through Vibrational Strong Coupling”, about the latest research that he is conducting in his group at TIFR (Tata Institute of Fudamental Research), Mumbai.