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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.