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The Alarm Clock
One of the most commonly used gadgets these days is the alarm clock, and it too had its origins in ancient Greece. Over time, the alarm clock has undergone a number of changes and improvements from the mechanical alarm to modern gadgets like cell phones, which come with an inbuilt alarm. The ancient Greek philosopher Plato (428–348 BC) was said to possess a large water clock with an unspecified alarm signal similar to the sound of a water organ. He used it at night, possibly for signaling the beginning of his lectures at dawn.
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