The invention of the printing press in 1440 reduced the cost of books by 300-fold within 50 years.
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A rhinoceros has thick skin for protection.
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A giraffe's heart can weigh over 20 pounds.
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The human spine consists of 33 vertebrae.
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The Earth is about 4.5 billion years old.
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Your brain uses 20% of your energy.
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The fennec fox has large ears that help dissipate heat.
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