Mars had an oxygen-rich atmosphere around 4 billion years ago
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Only about 2% of the world population has green eyes.
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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 Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
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Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
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