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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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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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There are more sensory neurons in the tongue than in any other part of the body.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.