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A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

HistoryOne small ahaInvention or discovery

The phonograph records and reproduces this form of vibration.

Think it. Then flip it. ahamoraTap to reveal Back to the cue
HistoryOne small aha
Your new ahaSound.

A phonograph records and reproduces sound using a moving physical trace. Source: Phonograph ↗

ahamoraReference ↗

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More from Inventions & Discoveries

A few more worth knowing.

  1. 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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  2. 42Jacquard loom · purpose of its punched cardsRECALL
    To control woven patterns.

    The idea of instructions encoded on cards later influenced computing history.

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  3. 43Transistor · the two key electronic functions it made compact and reliableRECALL
    Small, reliable switching and amplification.

    Transistors replaced bulky vacuum tubes in many devices and helped enable modern computing.

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