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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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 B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
More than 4.4billion prescriptions were dispensed within the United States in 2016.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.