Researchers in India and Italy say they have seen two types of liquid water that have long been suspected to exist below water's normal freezing point. Water is undoubtedly a strange liquid. Unlike most liquids, it becomes less rather than more dense when it freezes — and it is densest not when it is coldest (at 0 °C, just before it freezes) but at 4 °C. These are just two of water's host of anomalous properties, some of which are crucial to its behaviour in the natural environment. (source: nature.com)
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