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

Water defies the rules. Unlike typical liquids, it becomes denser as it cools—until hitting four degrees Celsius, then it starts getting less dense again. That quirk is why ice floats and why lakes freeze from the top down. According to Boing Boing, scientists now suspect liquid water has a secret: it might be two distinct molecular structures constantly swapping places—one dense and chaotic, the other loose and ordered. This switching game could explain all of water's strange anomalies.

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