I bought this book specifically for my own human factors knowledge in aviation. I have been trying to find a simplistic easy to read book like this and it has indeed already upgraded my respect for some of the effects of altitude. I recommend this book to any aviator experienced or inexperienced the knowledge attained from this book is what I believe paramount to grasping a health respect for what altitude can actually do to the human body and well as how certain parts of the human anatomy make it possible for us to soar the skies and for fill our flying dreams and or ambitions. Richard O Reinhart has written this book in a way which makes even the youngest of aviation enthusiasts appreciate what flying can and will do to someone if given the chance and gives me personally a very well rounded succinct insight into the importance of human factors and the lower atmosphere we call home.