Water breaks rocks, levels mountains, and cuts canyons. It comes in many forms, from puddles, to icicles, to mist, to tidal waves. It covers most of the Earth and constitutes a majority of the human body. Too much water can destroy entire regions-so can too little. Life depends on it. We drink it, bathe in it, swim in it, drown in it, fish in it, heat up and cool off in it. One of the most versatile and familiar elements in the world, water is...