In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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A cow produces around 200,000 glasses of milk in her lifetime.
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Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
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The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
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Only about 2% of the world population has green eyes.
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