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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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).
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.