The blue whale's heart is so large a human could crawl through its arteries.
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The human heart beats over 100,000 times per day on average.
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In 1809, two countries declared war and then forgot to sign a peace treaty for years.
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Insulin was first used to treat diabetes in the early 1920s.
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The barreleye fish has a transparent head and upward-facing eyes.
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The Moon was formed billions of years ago.
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The stegosaurus had a brain about the size of a walnut.
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A grizzly bear can run surprisingly fast over short distances.
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The Ice Age ended about 11,700 years ago.
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