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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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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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