Who was Typhoid Mary?
Medicine / Disease
Mary Mallon lived in New York about 100 years ago, and worked as a cook. It seemed that every family she worked for suffered an outbreak of typhoid fever! The Dept. of Public Health found that she har continue reading this fact
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What is Herd Immunity?
Medicine / Disease
No vaccine is 100% effective and usually does not work in 5% of those immunized. In addition, another 5% lose immunity after time. That means that, even after you are immunized, you could contract the continue reading this fact
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Hypotension
Medicine / Human Body
Bend to select a book from the lowest shelf, then rise quickly. Chances are, you'll feel a little lightheaded for a few seconds. The reason is a drop of blood pressure caused by the change in position continue reading this fact
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