Hello folks, I'm back after a loooong vacation. So: my popular-level article about "decenions," a new set of hypercomplex numbers analogous to octonions etc that I recently found, is online as an article in the current Mensa Bulletin. Link below. I think it's publicly available but let me know if any problems. Comments?
https://pubs.royle.com/publication/?i=849713&p=22&view=issueViewer