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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
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.
Did you know?
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.