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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
On average, the stomach produces 2 L of hydrochloric acid per day.
Vaccines prevent between 2.5 and 4 million deaths every year.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.