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A LITTLE SOMETHING WORTH KNOWING

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HistoryOne small ahaInvention or discovery

This Mainz craftsman is associated with Europe's influential movable-metal-type printing press.

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Your new ahaJohannes Gutenberg.

His workshop in Mainz produced printed books in the fifteenth century. Source: Johannes Gutenberg

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    Public clocks helped organize work, worship, markets, and urban life around visible hours.

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  3. 40The phonograph records and reproduces this form of vibration.RECALL
    Sound.

    Thomas Edison’s early device used a grooved cylinder to store sound vibrations.

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