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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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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Your thumb is about the same size as your nose.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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