Hey, that's me! Though I mention it in the post, I also want to give a shoutout here to libcalcium, which handles the somewhat magical task of representing and comparing exact algebraic numbers: https://fredrikj.net/calcium/index.html.
How did you do it? :-D
People writing monthly columns are always under pressure to find things that are new and can be made accessible, so if you have something that fits the subject and brief, it's easy. The problem is that most things you think are fascinating, the authors/journalists won't think is interesting, so you may need to sell them on it.
[0] Siobhan Roberts
[1] Roberts, Siobhan (2015). "Genius at play: The curious mind of John Horton Conway." Bloomsbury. ISBN 978-1620405932.