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1. How does a sundial work 2. How do water clocks measure time?
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What is a floral clock?
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1. Where did term grandfather clock originate? 2. What is the difference between a quartz watch and a mechanical watch?
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Who invented the quartz clock?
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Who invented the alarm clock?
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When was the first digital watch produced?
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Who set a doomsday clock for nuclear annihilation?
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What is the Internet?
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