Humans can detect as few as 5 photons of light — the eye is extraordinarily sensitive.
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A hyena’s jaw is powerful enough to crush bone.
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The human heart beats over 100,000 times per day on average.
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The human heart pumps blood through the circulatory system.
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Saber-toothed cats had elongated canine teeth.
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A polar bear’s fur traps heat efficiently.
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The Earth's magnetic poles slowly shift over time.
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The Sumerians developed one of the earliest known writing systems.
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