[escepticos] vidrio que fluye

["Ernesto" <cibernesto@...>]

Se comenta en una lista de correo (sobre dinosaurios, by the way) que
probablemente el vidrio sin fundir no sea un "líquido que fluye lentamente",
como se oye o se lee muchas veces. Abajo copio el párrafo sacado de dicha
lista ¿qué opináis?

_______________________
[Graydon] There are, indeed, church windows where the glass is thicker at
the
bottom than the top.  Since there are also windows of similar age where
the glass is thicker at the top than the bottom, and windows where the
thickness of the glass has no discernible vertical orientation, it's
regarded as most parsimonious to consider the variations in glass
thickness as a function of the available manufacturing techniques, which
could not produce glass of consistent thickness, rather than in-situ
changes due to behaviour under gravitational stress over time.