How likely do you think it is that there might have been a person in a the last 2000 years who solved one of life's great mysteries but never reported/recorded it?

I'm willing to believe they thought, "Wow! This is new! Oh, probably everyone else already knew it, it's just new to me. I'm kinda embarrassed it took me so long to figure it out. I'll just keep my previous ignorance to myself, by avoiding the whole topic."