Who First Used Keys?
Who First Used Keys? The first known form of lock and key was used by the Assyrians in the Middle East about 4,000 years ago. This was revealed by the discovery of such...
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What Makes Thunder?
What Makes Thunder? A bolt of lightning is a big electric spark. During a thunderstorm, electrical charges are built up in the clouds. When the charge becomes strong...
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What Causes Thunder?
What Causes Thunder? Thunder is caused by lightning. During a thunderstorm, electrical charges build up in the clouds. When a charge becomes strong enough, there is a...
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