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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.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Blood is approximately twice as thick as water because of the cells and other components found in it.