Professional cyclists train over 30,000 km per year — the equivalent of circling the globe.
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A sea anemone uses stinging cells to capture prey.
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Sea turtles have existed for over 100 million years.
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Early humans hunted megafauna during the Ice Age.
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The human skeleton renews itself over time.
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Pacemakers help regulate abnormal heart rhythms.
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A polar bear’s fur traps heat efficiently.
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Some sharks can sense a drop of blood from far away.
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The human body has over 600 muscles.
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