Vaccines prevent between 2.5 and 4 million deaths every year.
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The longest a person has survived after a heart transplant is 24 years.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
True-color image of layers of haze in Titan's atmosphere.