The Great Wall of China took over 2,000 years to build, constructed in sections by different dynasties.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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The Earth spins at 1000 mph.
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The human heart has four chambers.
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The heart pumps blood through approximately 60,000 miles of blood vessels.
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Many insects have exoskeletons that protect them from dehydration.
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A grizzly bear can run surprisingly fast over short distances.
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Border collies can learn hundreds of word-object associations.
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A king cobra can raise a third of its body off the ground.
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