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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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