As this self-reflective book demonstrates, when one takes up the serious study of water, one cannot but be surprised at how far that interest can take you: from the very origins of the cosmos right down to the unique structure and remarkable qualities of water as a molecule. It takes you to the depths of the oceans, to the upper reaches of the Earth's atmosphere, and into the centres of storms. You fall to Earth with raindrops, travel tiny streams and great rivers, go round and round in lakes and ponds. Your study takes you down to the very roots of trees, into the soil, along the dark, dank banks of underground rivers. It takes you from one person's thirst to the thirst of nations; from the demographics of the past to how those may drastically change in the absence of water in decades to come.