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ancient texts freely and to compare their own observations with those of fellow scholars. Although printers' blunders still often resulted in the spread of false data (for instance, in Galileo's Sidereus Nuncius (The Starry Messenger), published in Venice in 1610, his telescopic images of the lunar surface mistakenly appeared back to front), the development of engraved metal plates allowed accurate visual information to be made permanent, a change from previously, when woodcut illustrations deteriorated

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