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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Did you know?
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.