Before the invention of insulated glass (i.e. double-paned windows) in the 1930s, builders and architects had to balance bringing light into a structure with keeping heat transfer to a minimum. For buildings in most climates, that resulted in the use of small windows and not a lot of natural light. Insulated glass meant you could keep the heat in (or out) while letting in large amounts of light and this changed how both residential and commercial buildings were built. (via the morning news)
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