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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The human body produces and destroys 15 million blood cells every second.
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The longest a person has survived after a heart transplant is 24 years.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.