A narwhal’s tusk is actually an elongated tooth.
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A dog’s nose print is unique, similar to a human fingerprint.
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The Thirty Years’ War affected much of Central Europe.
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The Earth's rotation is gradually slowing over time.
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The human brain contains roughly 86 billion neurons.
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The human body produces red blood cells in bone marrow.
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Hippopotamuses secrete a reddish fluid that helps protect their skin.
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An adult giraffe can clean its ears with its tongue.
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The human body contains about 206 bones.
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