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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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Thyroid conditions may make getting pregnant impossible.

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Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Illicit drug use costs the United States approximately $181 billion every year.

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