The Earth's inner core is primarily iron and nickel.
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The McGurk effect shows how visual cues can alter what we hear.
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A blue whale's heart can weigh over 400 pounds.
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A giraffe's heart can weigh over 20 pounds.
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The pacemaker regulates irregular heartbeats.
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A narwhal’s tusk is actually an elongated tooth.
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The human brain continues to develop into early adulthood.
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The human heart beats over 100,000 times per day on average.
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Some snakes shed their skin multiple times a year.
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