Vaccines train the immune system to recognize pathogens.
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The Eiffel Tower was once the tallest man-made structure on Earth.
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The human heart beats over 100,000 times per day on average.
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Some sharks can sense a drop of blood from far away.
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A sea anemone uses stinging cells to capture prey.
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Rats can learn complex maze patterns quickly.
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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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The human body contains trillions of cells.
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