There are 20 feet of blood vessels in each square inch of human skin.
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The average adult has about 21 square feet of skin.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are 60,000 miles of blood vessels in every adult human.
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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.