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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
Blood is approximately twice as thick as water because of the cells and other components found in it.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.