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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Long-term studies of the Glanville fritillary butterfly, Melitaea cinxia, have provided exceptional Long-term studies of the Glanville fritillary butterfly, Melitaea cinxia, have provided exceptional
Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th Hyperopia (farsightedness). In the uncorrected top figure, the image would come into focus behind th
Bipolar disease. The term bipolar means “pertaining to two poles.” The individual with this form of Bipolar disease. The term bipolar means “pertaining to two poles.” The individual with this form of
The Role of Summation in Long-Term Potentiation The Role of Summation in Long-Term Potentiation
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Video: Sigmoidoscopy

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