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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.

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The average adult has about 21 square feet of skin.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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