Liquid water may be two different structures constantly swapping back and forth

Water is weird. Unlike any simple liquid, it becomes easier to compress as it cools, and it reaches its maximum density at 4C-not at its freezing point. This anomaly is why ice floats and lakes freeze from the top down. For decades, scientists have suspected that liquid water is actually a shifting mix of two distinct molecular arrangements: one dense and chaotic, the other loose and ordered. - Read the rest

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