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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The longest a person has survived after a heart transplant is 24 years.
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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.
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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.