Mars had an oxygen-rich atmosphere around 4 billion years ago
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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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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