If there is one greatest asset mankind has, it is his home planet. Earth is a very special place in our scheme of things. Until we are able to inhabit other planets and heavenly bodies, it is the only place where we can live. Only place to exist. Among the many gifts of earth is the gift of water. Countless billions have been spent looking for water in our solar system. But Earth is definitely the only place where the life giving water is so abundanlty available. Water is a scare resource. It is sufficient for many more millenia to come, but there are still many issues concerning water. Water when refered by us mainly means fresh water resource. And fresh water is even scarcer resource. It reminds me of a anecdote, when one of our professors wanted to teach us about infinity. He asked us, what would happen if we take a bucket of water from the ocean. The standard reply was nothing. What is a bucket of water when, ocean is so full. But the right answer was ocean would be shorter by a bu...