The Berlin Glass

A long time ago, Vikings in Scandinavian countries used to live in mud huts where they struggled to get both light and heat. If they punched a hole in the wall to let the bright daylight come in, the hut would go freezing cold. But if they blocked the opening to stay warm, they had to sit in the dark. The advent of industrial revolution solved the problem.(..)

intellectual - Arun Nathani Blog