We had the opportunity to visit the TUHH in Hamburg over a two-day period, engaging with the Institute for Multiphase Flow as well as the Institute of Bioprocess and Biosystems Engineering.During this visit, Professor Michael Schlüter and Professor Anna-Lena Heins guided us through their respective institutes. Over the course of these two days, we gained valuable insights into the mixing time in bioreactors and the heterogeneity of cells. Thank you for this great opportunity!