In case the authors are here, the first sentence contains the bytes e2 80 94 which would be UTF-8 for an em dash, but it has been reinterpreted as 3 bytes using https://en.wikipedia.org/wiki/Windows-1252#Code_page_layout and shown on the page as —. Further down, there's a lot of similar errors such as a single right quote (U+2019) in K'nex. Firefox seems to have first removed their encoding configuration menu in version 89, then introduced a new button in version 91, and that one is disabled now as well so there's no fixing this user-side it seems :/

Edit: ah the page is from 2012-03-19, from the <meta property="article:published_time"> tag

This is probably the case of a bodged migration from one CMS to another.

My blog suffered the same, and going through loads of old pages to check and fix them just isn't worth the effort.

> Why shouldn’t we be able to?

I have no idea why but my brain immediately interpreted this as a Scottish accent, like ‘shouldnae’. Weird.