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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
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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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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.