“…One can find a few indirect confirmations of this idea in the literature. First, the physical properties of certain supercooled and equilibrium melts display pronounced hysteresis upon heating ↔ cooling [11][12][13][14][15][16] implying relatively large time constants for underlying structural changes. It might be supposed, however, that in the absence of changes in the liquid short-range order the relaxation time should be comparable to τ m .…”