The Earth's rotation speed varies slightly over time.
Fact #237
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The first artificial heart was implanted in the 1980s.
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Curiosity can enhance learning and memory retention.
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Camels have specialized red blood cells that help them survive dehydration.
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The barreleye fish has a transparent head and upward-facing eyes.
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A horned lizard can squirt blood from its eyes as a defense.
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The human stomach can expand significantly after a large meal.
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The human skeleton is made up of over 200 bones in adulthood.
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Some animals can regenerate entire body parts.
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