Polar bears have a thick layer of fat to retain body heat.
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Fingernails grow faster than toenails.
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The wheel is one of the earliest human inventions.
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The Moon was formed billions of years ago.
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The human heart beats over 100,000 times per day on average.
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Monoclonal antibody therapies treat various diseases.
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The human brain continues to develop into early adulthood.
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Some fish can learn by observing other fish.
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The Earth's axis is tilted about 23.5 degrees.
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