The human body produces and destroys 15 million blood cells every second.
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Cyanide works by making the human body unable to use oxygen.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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.