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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.
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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 one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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Illicit drug use costs the United States approximately $181 billion every year.