Mars had an oxygen-rich atmosphere around 4 billion years ago
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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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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
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There is a persistent storm in Venezuela that produces lightning 140 to 160 nights a year, 10 hours per day and up to 280 times per hour and has been going since at least the 16th century.
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