Jonathan Reisman - MD, traveler and naturalist - invites readers on a fascinating journey through our bodies. With unique insight, Reisman tells how to diagnose a heart attack, what the body actually consists of (spoiler: mostly mucus, not water), how the composition of urine can "read" the origin of humanity and many other interesting facts. Through his lengthy work in health care and his wanderlust, Reisman looks at the human body through an unusual lens: Traveling to Alaska shows that fat is not the enemy, but the hero; staying in the Himalayas opens the border where the brain ends and the mind begins; and eating a ram's head in Iceland teaches a lesson in empathy. Linking his rich experience gained in different countries among unique cultures with the internal structure of the human body, the author shows how our organs are inextricably intertwined with each other - this is a real internal ecosystem that reflects the natural world around us. Reisman offers a new and very exciting perspective and helps us re-understand our bodies and how they work - in a way we never imagined before.