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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.