In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
The phosphorus cycle.
calvin cycle5
Reactions of the Krebs cycle.
Typical life cycle of the tick family.
Major regulatory factors controlling pyruvate dehydrogenase and the citric acid cycle
The rock cycle and the Earth’s physical environment