The first permanent photograph required 8 hours of exposure — modern cameras expose for 1/8000th of a second.
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The FBI conducted surveillance of civil rights leaders during the 1960s.
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Some people have survived being buried alive.
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Petra in Jordan was carved into rose-colored rock cliffs.
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The Sydney Harbour Bridge is one of the largest steel arch bridges.
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Sinkholes can form when underground rock dissolves.
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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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Pompeii was buried by the eruption of Mount Vesuvius in 79 CE.
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