4.0

I'd heard lots of great things about this so I was happy to see it available as an audiobook that happened to be the approximate length of my last trip! It's definitely a great book--great research, wildly interesting story--and it kept me engaged while I drove. The narrator does a fine job.

That said, I think I'd have preferred to read this in print--I kept wanting to flip back and remind myself about who was doing what, and it's annoying to do that in audio.

Still: a super fun, impressive book--a great great blend of history, science, and biography. (I'm late to the party on this one so you probably already know that.)