The blue whale's heartbeat can be heard from two miles away.
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The brain named itself.
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The human eye has a natural blind spot.
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The Arctic hare has short ears to minimize heat loss.
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The Human Genome Project mapped the entire human genetic sequence.
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Some animals sleep for years.
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The steam engine powered early industrial machinery.
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The Moon was formed billions of years ago.
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The human body produces red blood cells in bone marrow.
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