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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?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Did you know?
Illicit drug use costs the United States approximately $181 billion every year.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.