Fighting Techniques of the Medieval world
"When a technology has clear value proposition to a specified market segment, it is invariably adopted at an accelerated rate."
eg windmill technology in 12th century.
knowing the patterns of wind.
Getting the windmill to start on light winds is a consideration.
Exploring the role of windows and stained glass in Gothic Cathedrals
"the weight of the windows allowed for the use of thinner walls and larger windows, which allowed for more light and a greater sense of openness within the cathedral."
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