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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.