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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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People about to have surgery must tell their health care providers about all supplements they take.
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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.