My most recent email with Nick seemed pretty alert and well written. That was maybe a month ago? I had purchased a very unusual rack and pinion style rear scope mount and sent him pictures to identify it. He had never seen one, so I'm still trying to figure out who made it. But he jokingly told me I should write an update to his books, as he said he's too old and tired to do one. There's a huge number of scopes and sights not covered in Nick's 3 books on these topics.