4.0

This could be a few smaller books, covering a few different topics. It did drag a little in places but mostly it was just a fascinating look at how modern electronics manufacturing gets done, plus getting to see some clever hardware (and biological) hacking. Did you know that SD cards contain a microcontroller? These guys did, and then built a REPL to talk to it. Lots of other stuff like that. Really if this could be better organized it could be a perpetual series of books, or a video series, etc.. I'd be into that. In short, recommended if you're nerdy and especially have some electronics savvy. Might be less interesting for a non-technical reader.