Without water and the strange properties it has there would be no life:-http://www.nature.com/ncomms/2015/151208/ncomms9998/full/ncomms9998.html-"Water is the most important liquid for our existence and plays an essential role in physics, chemistry, biology and geoscience. What makes water unique is not only its importance but also the anomalous behaviour of many of its macroscopic properties. The ability to form up to four hydrogen bonds (H-bonds), in addition to the non-directional interactions seen in simple liquids, leads to many unusual properties such as increased density on melting, decreased viscosity under pressure, density maximum at 4?°C, high surface tension and many more (see, for example, http://www.lsbu.ac.uk/water/index.html). If water would not behave in this unusual way it is most questionable if life could have developed on planet Earth."-Comment: A highly complex physical analysis of the unique properties of water. It is like no other liquid.