Your body produces about a liter of mucus every day — most of it you swallow.
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The human body has over 600 muscles.
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The Earth's outer core is liquid metal.
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Giraffes have high blood pressure to pump blood to their brains.
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Ankylosaurs had armored bodies and clubbed tails.
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The first forests appeared during the Devonian period.
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The fennec fox has large ears that help dissipate heat.
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The Arctic hare has short ears to minimize heat loss.
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A hyena’s jaw is powerful enough to crush bone.
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