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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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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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In women, pharmacodynamic differences include increased sensitivity to (and increased effectiveness of) beta-blockers, opioids, selective serotonin reuptake inhibitors, and typical antipsychotics.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.