My plan is to broaden the audience with more English content and, of course, lobby for a fact-based scientific approach. I would like to tackle the problems we have with the tools that are suitable and not just run after trendy methods for the sake of their "coolness".

Hope dies last that sth positive will emerge from the current crisis at universities... I have written the statement that outreach is more important than class-room-teaching so many times and it wasn't well received. Let's hope this attitude changes now!

That's wonderful! Interdisciplinary knowledge exchange is refreshing. I love such things! Happy to see you accepted the invitation, enjoy!

6) This explains why mass estimates based on vel disps can be very accurate for high-z clusters based on the Delta v infall model!
For the rest, never underestimate unobserved velocity components, even at distances of 150 Mpc and validate your assumptions by simulations.

5) Yet, for each structure, the velocity dispersion of all infalling galaxies of the minor and major models yield lower (blue) and upper bounds (red) on the true vel disp. For small theta, the vel disp from Delta v is even a great estimate for the true one (grey on the black)!