The average human heart beats 3 billion times over the course of a lifetime.
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The learned helplessness theory explains passivity after repeated failure.
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The axolotl can regenerate limbs and even parts of its heart.
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Many insects have exoskeletons that protect them from dehydration.
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A sea anemone uses stinging cells to capture prey.
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The fangtooth fish has some of the largest teeth relative to body size in the ocean.
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Giraffes have high blood pressure to pump blood to their brains.
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The Earth's rotation causes day and night cycles.
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The Nile River has supported civilizations for thousands of years.
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