BODY FACTS
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The longest bone is the femur, in the thigh. It makes up almost one-quarter of the body's total height.
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The smallest bone is the stirrup, deep in the ear. It is hardly larger than a grain of rice.
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There are about 60 muscles in the face. Smiling is easier than frowning. It takes 20 muscles to smile and more than 40 to frown.
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The heart beats around 3 billion times in the average person's life.
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It takes about 1 minute for a red blood cell to circle the whole body.