https://www.theguardian.com/uk-news/shortcuts/2017/feb/19/there-is-no-rule-of-six-the-truth-about-the-science-of-queueing
There is no ‘rule of six’ – the truth about the science of queueing
You wait longer when other people are behind you, we should stand on both sides of an escalator, and we usually get away with pushing in. Psychology professor Adrian Furnham explains what studies show us about standing in line.
The article isn't very long, but I enjoyed it a lot.
The whole article reminded me of my time (4 years) studying landscape architecture - a number of the first classes had to with people's needs regarding space, comfort zones, which vary a lot. I remember one assignment, to stand too close to someone in line, and notice what the person did.. ick, I hated that one. I did a lot of reading back then about people in cities, and then watching. Jane Jacobs (The Death and Life of Great American Cities) and, dammit, a guy I can't remember the name of as I type. William Something, I think.
If this is confusing (what, no list of plants?) a lot of landarchs are involved in city planning as well as site planing, and, sure, knowing plants.
So, the article is a saver for me. Makes me want to read Jacobs again. Unfortunately, I gave my well worn book away, to an architect pal.