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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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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.