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The longest a person has survived after a heart transplant is 24 years.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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