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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
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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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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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