Turn on the tap and out it comes – water. We drink it, we wash with it, we swim in it. Pure water is colorless and odorless and has no taste. Yet it has so many stories to tell. 75 percent of the Earth’s surface is covered by water in liquid and frozen forms – 71 percent in the world’s seas and oceans, some three percent as ice and just one percent in lakes and rivers. Indeed, over a period of one hundred years,a water molecule spends on average 98 years in the sea, 20 months in ice, two weeks in rivers and lakes, and less than a week as gas in the atmosphere. However, of all the water on Earth, only 2.5 percent is drinkable freshwater – and just 0.3 percent of this is accessible to humans.