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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
Blood is approximately twice as thick as water because of the cells and other components found in it.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.