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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.