This very regular arrangement of molecules had already been observed in solid structures of natural or artificial compounds, but is difficult to observe in solution, where the water molecules are very mobile. (sciencedaily.com)
Slow cooling of conventional glass - forming liquids causes their atoms to organize themselves into regular arrangements, producing a crystallized material. (sciencedaily.com)
Any given volume of water contains two types of molecular structures — one a blobby, loosely packed agglomeration and the other a tight, regular arrangement resembling a crystal lattice. (sciencemag.org)