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 focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
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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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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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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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There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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