There are exactly as many even numbers as there are whole numbers — both are infinite sets of the same size.
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A group of porcupines is called a prickle.
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In 1947, the Roswell incident sparked decades of speculation about extraterrestrial life.
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Nothing can travel faster than light in a vacuum.
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Nothing can travel faster than light in a vacuum.
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Blizzards are intense snowstorms with strong winds.
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There are invisible colors humans cannot see.
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The zipper made clothing fastening easier.
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