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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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