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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.
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.
The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.