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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).