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A LITTLE SOMETHING WORTH KNOWING

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HistoryOne small ahaInvention or discovery

Mechanical clock · what it made easier to coordinate across a community

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HistoryOne small aha
Your new ahaShared time.

Public clocks helped organize work, worship, markets, and urban life around visible hours. Source: Clock ↗

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  1. 39Nineteenth-century bicycle · the new opportunity it offered many individualsRECALL
    Affordable personal mobility.

    Bicycles also influenced clothing, city life, recreation, and women’s independence.

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  2. 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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  3. 41Early radio · the kind of signals it transmittedRECALL
    Wireless signals.

    Radio soon became a mass medium for news, music, sport, and emergency communication.

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