My wife, Janet, has been on MM twice. Once on BBC and again when it migrated briefly to the discovery channel.
One of the problems choosing a subject is that you can’t choose one that’s been done before ( or you couldn’t when Janet competed twenty odd years ago). The very early choices were quite wide and subsequently limited later contestants choices which is why you sometimes get highly specific subjects with a date range.
Also some of those subjects are very specific and when the researchers look for information they find that the contestant wrote the book.
Me: The Classical Druid Record 140BCE to 360CE. No I didn’t write it but there are only nine pages of it.
Were I to be successful I’d need another subject so that could be: The Universe