The first photograph ever taken required an 8-hour exposure time in 1826.
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A falcon can dive at speeds over 200 mph.
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The camera allowed images to be captured and preserved.
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Sleep plays a critical role in memory consolidation.
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The Gulf of Tonkin incident was later shown to involve disputed reports of attacks.
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The eruption of Mount Vesuvius buried the city of Pompeii.
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Narwhals are known for their long spiral tusks.
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