A fascinating topic made frustrating by a flippant and awkward tone throughout. While I learned quite a bit (the information about bats as carriers is quite interesting), Quammen's tone is almost too casual, and his diversions into sarcastic observations are unnecessary. I'm not a scientist, and I know this book is written for the layperson, but a slightly more professional tone would have kept me more involved. As it is, I'm likely to recommend his book, but with the warning that the tone might put some people off. Academic writing doesn't need to be boring nor dry, and popular science writing doesn't need to be uptight and snarky. Find a happy medium.