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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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The horizontal fraction bar was introduced by the Arabs.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.