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SEM image and schematic illustrations of a silicon AFM tip used to study the viscosity of water confined in a subnanometer gap above a flat solid surface. The circular inset depicts individual water molecules in the gap. [Tai-De Li, Jianping Gao, Robert Szoszkiewicz, Uzi Landman, and Elisa Riedo, Phys. Rev. B 75, 115415 (2007)] |


