Vaccines prevent between 2.5 and 4 million deaths every year.
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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 first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
Cellular section from the brain of a person who died from Alzheimer's disease.
Sagittal section of upper respiratory system illustrating the internal anatomy of the nasal cavity,