Middle Ages 9: Knowledge and Ignorance in the Middle Ages (and Today)
Historiansplaining: A historian tells you why everything you know is wrong
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The Mediaeval Machine
In the eleventh twelfth centuries, europeans began to make tanning mills for making leather. The first vertical windmills with a vertical turning sails were invented by the 11 eighties in england. Also, human powered treadmills, where mill would be driven by human inside. There was also a great advance in experimentation in optics. And he invented the first magnifying glass at in 12 50.
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