Great photo! Have you been to Shiva? It’s an 80ish arm cactus just west of Tucson and on public land. I can send you the coordinates if you would like, it’s really neat!

My favorite.

I started this today and I feel like I have learned more about science than in all of high school. This author also did a book on the human body which will be my next read. I will look for a used copy of the one you are reading, looks right up my alley.