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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).
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
Excessive alcohol use costs the country approximately $235 billion every year.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.