Dogs' brains release oxytocin when they look at their owners, strengthening emotional bonds.
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Humans are the only primates with whites (sclerae) visible in their eyes, which helps with social communication.
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The human skeleton renews itself over time.
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Your body makes about 25 million new cells every second.
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Your brain controls your body.
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The human nose can distinguish over one trillion different scents.
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Your brain can store the equivalent of millions of gigabytes of information.
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The human heart has four chambers.
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Your body replaces cells constantly.
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