This was so very close to being a DNF for me as there is a LOT of maths and science involved, particular in the beginnings that were going over my head. However, I was encouraged to persist and I'm glad I did. The journey and humanity of the tale that comes strongly into the second half made it worth it - you can let the technical stuff go over your head & still get the gist. Audiobook as opposed to text almost feels like a MUST, due to a very specific element in the story. I'm sure I wouldn't have had the same experience had I read it in text. Narrator was fantastic.