...the invention of eyeglasses in the 12th century not only made it possible to improve defective vision but suggested the idea that human beings need not accept as final either the endowments of nature or the ravages of time. Eyeglasses refuted the belief that anatomy is destiny by putting forward the idea that our bodies as well as our minds are improvable. (p.14)
(commenting on the idea that every new technological innovation changes the way we think)
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