1975The first digital camera weighed about 4 kg.

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Kodak engineer Steven Sasson built it in 1975; one photo took 23 seconds to record to cassette tape.

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<span class="aj-year">1989</span>The World Wide Web was proposed as a way to share physics documents.<span class="aj-year">1994</span>The QR code was invented to track car parts.<span class="aj-year">1896</span>The first escalator was a fairground ride.