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There are 20 feet of blood vessels in each square inch of human skin.
Asthma cases in Americans are about 75% higher today than they were in 1980.
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).
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.