Mars had an oxygen-rich atmosphere around 4 billion years ago
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The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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