The blue whale's heartbeat can be detected from two miles away.
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The Earth spins at 1000 mph.
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The human body is about 60% water.
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Grizzly bears can run at speeds over 30 miles per hour.
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Fingernails grow faster than toenails.
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The wheel is one of the earliest human inventions.
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The human eye has a natural blind spot.
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Certain reptiles regulate body temperature through basking.
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Extreme droughts can last for years.
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