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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.
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Vaccines prevent between 2.5 and 4 million deaths every year.