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Water has unique properties, and each discovery about it underlines this fact. A new type of amorphous (non-crystalline) ice has been discovered. Amorphous ice is rare on earth but plentiful in space -- and may also be the major form of ice in Jupiter's large moons, causing tectonic shifts & quakes. All this variety & potency from 2 pairs of electrons in empty orbitals!
https://scitechdaily.com/new-form-of-ice-discovered-may-shake-up-our-understanding-of-water/