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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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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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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.