The city of Jericho is one of the oldest known walled cities.
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The Ice Age allowed humans to migrate across land bridges.
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The Federal Reserve System was established in 1913.
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In 1947, the Roswell incident sparked decades of speculation about extraterrestrial life.
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The Burj Khalifa is the tallest building in the world.
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The first Paralympic Games were held in 1960.
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A group of kittens is called a kindle.
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Nothing can travel faster than light in a vacuum.
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Sinkholes can form when underground rock dissolves.
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