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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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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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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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