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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.
The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
Blood is approximately twice as thick as water because of the cells and other components found in it.
The longest a person has survived after a heart transplant is 24 years.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.