UPDATE! More about if or when the US converts to metric. Earlier today, I accidentally came across some new material that was too relevant to these posts to l

UPDATE! More about if or when the US converts to metric. Earlier today, I accidentally came across some new material that was too relevant to these posts to let it pass by. Here's a quote from a part of my post [https://news.ycombinator.com/item?id=24819990 https://news.ycombinator.com/item?id=24819990] to a related matter: "... Incidentally, by sheer happenstance, earlier today in connection with another matter altogether, I was reading the preface in one of my old mathematics textbooks, that being Calculus by Stanley I Grossman, first edition 1977 [43 years ago] and I came across an interesting comment that's pertinent to this discussion. I quote: "… Moreover, I have included "real-world" data whenever possible, to make the examples more meaningful. For example, students are asked to find the escape velocity from Mars, the effective installment rate of a large purchase, and the optimal branching angle between two blood vessels. Finally, as most of the world uses the metric system and even the United States is reluctantly following suit, the majority of the applied examples and problems in the book make use of metric units." Oh dear, dear, what ever happened? Keep in mind that Grossman was no minor author; he was well in tune with what was happening, he wrote many mathematics textbooks and they were widely used in colleges, universities and US schools, and across the world. Moreover, he wasn't an outsider looking in, he was based at the University of Montana and his publisher was Academic Press which was based in New York!"