The Parthenon has no perfectly straight lines — all horizontals curve slightly to appear straight to the human eye.
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A sea anemone uses stinging cells to capture prey.
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The Eiffel Tower was once the tallest man-made structure on Earth.
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A polar bear's fur is actually transparent.
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Octopuses have three hearts and blue blood.
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The human body produces red blood cells in bone marrow.
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The human skeleton renews itself over time.
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Your bones are stronger than steel.
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